Appellant’s principal contention in this appeal from an order denying P.C.H.A. relief1 is that trial counsel was ineffective when, after introducing evidence of an alibi defense, he failed to request the court to instruct the jury on the significance of the alibi evidence. Post-trial and appellate counsel are also alleged to be ineffective for failing to preserve for direct review the absence of such an instruction.
Donald Gainer was tried by jury and, on March 1, 1985, was found guilty of two counts of arson and one count of risking a catastrophe in connection with a fire which had destroyed the Arcade Theatre on the South Side of Pittsburgh on February 5,1984. Gainer was represented at trial by John O’Connor, Esquire,2 who withdrew after filing post-trial motions. The Public Defender’s Office was then appointed to represent Gainer and filed supplemental post-trial motions. The Public Defender subsequently withdrew *351from the case because of a potential conflict of interest, and Joseph Vogrin, Esquire, was appointed to represent appellant. He filed a second supplemental motion for post-trial relief in which he raised additional issues. After an evidentiary hearing had been held on post-trial motions, relief was denied, and Gainer was sentenced to serve an aggregate term of imprisonment of not less than twenty (20) years nor more than forty (40) years. The Superior Court, on direct appeal, affirmed the judgment of sentence.3 On April 6, 1987, Gainer filed a pro se P.C.H.A. petition, and Dennis I. Turner, Esquire, was appointed to represent him. Subsequently, Gainer retained the services of Michael J. Healey, Esquire, who currently appears as counsel for the defendant. An evidentiary hearing was held on October 27, 1988, after which the P.C.H.A. court issued an order denying post conviction relief. It is from the order denying post conviction relief that the instant appeal has been filed.
In Commonwealth v. House, 371 Pa.Super. 23, 537 A.2d 361 (1988), the Court said:
Because the law presumes that counsel is effective, the burden of establishing ineffectiveness rests with appellant. Commonwealth v. Floyd, 506 Pa. 85, 90, 484 A.2d 365, 367 (1984); Commonwealth v. McKendrick, 356 Pa.Super. 64, 71, 514 A.2d 144, 148 (1986), allo, denied, 514 Pa. 629, 522 A.2d 558 (1987). To meet that burden, appellant must demonstrate that 1) the issue underlying his claim of ineffectiveness is of arguable merit; 2) the course chosen by counsel had no reasonable basis designed to serve his interests; and 3) he suffered prejudice as a result of counsel’s ineffectiveness. Commonwealth v. Pierce, 515 Pa. 153, 158-160, 527 A.2d 973, 975-76 (1987); Commonwealth v. Buehl, 510 Pa. 363, 378-79, 508 A.2d 1167, 1174-75 (1986); Commonwealth ex rel. Washington v. Maroney, 427 Pa. 599, 604-5 & n. 8, 235 A.2d 349, 352-53 & n. 8 (1967).
Id., 371 Pa.Superior Ct. at 28, 537 A.2d at 363. See: Commonwealth v. Davis, 518 Pa. 77, 83, 541 A.2d 315, 318 (1988); Commonwealth v. Riggins, 374 Pa.Super. 243, 248-*352249, 542 A.2d 1004, 1007 (1988). Establishing prejudice “requires [a] showing that counsel’s errors were so serious as to deprive the defendant of a fair trial, a trial whose result is reliable.” Strickland v. Washington, 466 U.S. 668, 687, 104 S.Ct. 2052, 2064, 80 L.Ed.2d 674, 693 (1984). Moreover,
“[bjefore a claim of ineffectiveness can be sustained, it must be determined that, in light of all the alternatives available to counsel, the strategy actually employed was so unreasonable that no competent lawyer would have chosen it.” Commonwealth v. Miller, 494 Pa. 229, 431 A.2d 233 (1981). We inquire whether counsel made an informed choice, which at the time the decision was made reasonably could have been considered to advance and protect defendant’s interests. See Commonwealth v. Hill, 450 Pa. 477, 301 A.2d 587 (1973). Thus, counsel’s assistance is deemed constitutionally effective once we are able to conclude the particular course chosen by counsel had some reasonable basis [designed] to effectuate his client’s interests. The test is not whether other alternatives were more reasonable, employing a hindsight evaluation of the record. Commonwealth ex rel. Washington v. Maroney, 427 Pa. 599, 604, 235 A.2d 349 (1967).
Commonwealth v. Dunbar, 503 Pa. 590, 596, 470 A.2d 74, 77 (1983). See also: Commonwealth v. Akers, 392 Pa.Super. 170, 190, 572 A.2d 746, 755-756 (1990); Commonwealth v. Harner, 377 Pa.Super. 229, 243-244, 546 A.2d 1241, 1247-1248 (1988).
Instantly, both appellant and his girlfriend, Sandra Christensen, testified at trial that appellant had been at Christensen’s home at the time when the fire occurred. According to their testimony, appellant had picked Christensen up at work at or about 9:00 p.m., and the two had gone out until 1:00 a.m., when they returned to Christensen’s home. A babysitter, Ann Ryderewski, confirmed that appellant and Christensen had returned to Christensen’s home about 1:00 a.m., but Ryderewski said she had fallen asleep shortly thereafter and could not say whether appellant and Chris*353tensen were still in the house when the fire occurred at or about 2:30 a.m.
A review of the record makes it abundantly clear that the alibi testimony was a major part of appellant’s defense. It was presented to the jury during trial and emphasized during counsel’s closing argument. Despite appellant’s reliance on the defense of alibi, the trial court did not instruct the jury regarding the significance or effect of the alibi evidence. Indeed, the subject of alibi was not mentioned during the court’s charge to the jury. Trial counsel, moreover, did nothing to request such an instruction or object to the absence thereof. The failures of court and counsel were not raised in post-triál motions and, of course, were not argued on direct appeal. They were raised for the first time in appellant’s pro se brief in support of his P.C.H.A. petition, and were argued at the evidentiary hearing held on October 27, 1988.
Because appellant contends that all prior counsel were ineffective for failing to assert the absence of an alibi instruction this issue has been properly raised. It was raised at the first opportunity at which appellant was no longer represented by those lawyers whose effectiveness was being challenged. See: Commonwealth v. Cargo, 498 Pa. 5, 19, 444 A.2d 639, 646 (1982); Commonwealth v. Seachrist, 478 Pa. 621, 624, 387 A.2d 661, 663 (1978).
“Alibi is a defense that places the defendant at the relevant time in a different place than the scene involved and so removed therefrom as to render it impossible for him to be the guilty party.” Commonwealth v. Whiting, 409 Pa. 492, 498, 187 A.2d 563, 566 (1963). In Commonwealth v. Bonomo, 396 Pa. 222, 151 A.2d 441 (1959), the Supreme Court said:
The Commonwealth has the burden of proving every essential element necessary for conviction. If the defendant traverses one of those essential elements by evidence of alibi, his evidence will be considered by the jury along with all the other evidence. It may, either standing *354alone or together with other evidence, be sufficient to leave in the minds of the jury a reasonable doubt which, without it, might not otherwise exist. It will be the duty of the trial judge to carefully instruct the jury as to the relationship of the evidence of the prosecution and the evidence of the defendant as each bears upon the essential elements of the crime charged. This must be done without unfair disparagement although the trial judge must be left free to comment upon the evidence, as he has done heretofore, so long as he leaves the jury free to find its own true verdict.
Id., 396 Pa. at 231-232, 151 A.2d at 446. Subsequently, in Commonwealth v. Pounds, 490 Pa. 621, 417 A.2d 597 (1980), the Supreme Court held that when a defendant introduces evidence of alibi he is entitled to have the jury instructed that it should return a verdict of acquittal if the defendant’s alibi evidence, “even if not wholly believed, raise[s] a reasonable doubt of his presence at the scene of the crime at the time of its commission and, thus, of his guilt.” Id., 490 Pa. at 633, 417 A.2d at 603 (footnote omitted). “Where an alibi defense is presented, such an instruction is necessary due to the danger that the failure to prove the defense will be taken by the jury as a sign of the defendant’s guilt.” Id., 490 Pa. at 633-634, 417 A.2d at 603 (footnote omitted). The Pounds rationale was reaffirmed by the Supreme Court in Commonwealth v. Willis, 520 Pa. 289, 553 A.2d 959 (1989).4
The Commonwealth attempts to distinguish these Supreme Court decisions because they involved refusals by trial courts to give an alibi instruction and did not hold that trial counsel was ineffective for failing to request such an instruction. This is a distinction without a difference. In either event, the jury was not adequately instructed. The issue of the ineffectiveness of counsel for failing to request *355an alibi instruction was addressed by the Superior Court in Commonwealth v. Brunner, 341 Pa.Super. 64, 491 A.2d 150 (1985), where, after reciting the holdings of Bonomo and Pounds, the Court concluded:
In the case sub judice, appellant’s only witness had been an alibi witness. A correct jury instruction, therefore, was vital. Appellant’s counsel, however, did not request such an instruction; and when the court gave none, counsel failed to object.
In the face of this obvious dereliction, appellant’s counsel testified at the P.C.H.A. hearing that he didn’t request a specific alibi instruction because he didn’t believe the alibi witness. Neither he nbr the Commonwealth has been able to explain how the failure to request an alibi instruction after the alibi witness had testified could reasonably be calculated to serve the best interests of counsel’s client. The witness had testified; the alibi evidence was before the jury; and appellant was entitled to a specific instruction from the court regarding its significance. When the trial court failed to deliver the required instruction, counsel had a duty to request it to do so and, if the request was denied, to preserve the court’s error by an appropriate objection. To fail in this respect was so unreasonable that it must be equated with constitutionally ineffective assistance.
Id., 341 Pa.Superior Ct. at 70, 491 A.2d at 153. The same conclusion was reached in subsequent Superior Court decisions. See: Commonwealth v. Nauman, 345 Pa.Super. 457, 498 A.2d 913 (1985); and Commonwealth v. Roxberry, 381 Pa.Super. 314, 553 A.2d 986 (1988), allocatur granted, 523 Pa. 649, 567 A.2d 652 (1989).
The decided cases, therefore, are clear. Where alibi evidence has been introduced and where, as here, defense counsel has argued an alibi defense to the jury, an alibi instruction by the court, is essential. For the trial court to fail to give such an instruction is error. For defense counsel to fail to request an alibi instruction or object to the trial court’s omission thereof renders counsel constitutional*356ly ineffective. As the Court said in Commonwealth v. Nauman, supra,
[w]here, as here, appellant’s counsel gave notice of an alibi defense and actually introduced evidence of alibi, there can be no reasonable basis for failing to request an alibi instruction. See: Commonwealth v. Brunner, supra. See also: Commonwealth v. Hoang Khai Tran, 307 Pa.Super. 489, 453 A.2d 993 (1982). There was nothing to lose and everything to gain by having the trial court explain to the jury that even if the jury did not wholly believe the alibi testimony it should nevertheless find appellant not guilty if it had a reasonable doubt about appellant’s presence at the time of the alleged offense. The failure to request such an instruction was ineffectiveness requiring a new trial.
Id., 345 Pa.Superior Ct. at 464, 498 A.2d at 916. See also: Commonwealth v. Roxberry, supra; Commonwealth v. Brunner, supra.
The absence of an alibi instruction, it has been held, is not harmless error. Commonwealth v. Willis, supra, 520 Pa. at 294, 553 A.2d at 962. In the absence of such a necessary instruction, “conviction may have resulted from the jury’s inference of guilt from a perceived failure on the [appellant's part to clearly establish the alibi.” Id. Similarly, the dereliction of trial counsel must be deemed prejudicial. For the jury to be given evidence of alibi and not to be told of its significance, i.e., how to use it, is to impair the jury’s ability to return a reliable verdict. Because counsel’s dereliction was prejudicial, it can be corrected only by awarding appellant a new trial.
There is no merit in appellant’s remaining argument that his trial counsel was ineffective for failing to request an accomplice or corrupt source instruction with respect to the testimony of Walter Sparks, a prosecution witness. An accomplice charge is required only when the evidence permits an inference that the witness was an accomplice. Commonwealth v. Upshur, 488 Pa. 27, 32, 410 A.2d 810, 812 (1980); Commonwealth v. Smith, 343 Pa.Super. 435, 447, 495 A.2d 543, 549 (1985). See also: Commonwealth v. *357Sisak, 436 Pa. 262, 268, 259 A.2d 428, 431-432 (1969); Commonwealth v. Howard, 375 Pa.Super. 43, 50, 543 A.2d 1169, 1172 (1988). The justification for the instruction is that an accomplice may inculpate others out of a reasonable expectation of leniency. Commonwealth v. Upshur, supra; Commonwealth v. Thomas, 479 Pa. 34, 37, 387 A.2d 820, 822 (1978); Commonwealth v. Watts, 348 Pa.Super. 224, 228, 501 A.2d 1152, 1154 (1985); Commonwealth v. Smith, supra.
In the instant case, however, there was no evidence from which the jury could have reasonably inferred that Sparks was an accomplice of appellant in starting the fire at the Arcade Theatre. The testimony was that Sparks had declined appellant’s offer of money to assist in setting the fire. This testimony was uncontradicted. Sparks also testified that after the fire appellant had. admitted setting it. There was, therefore, no evidence that Sparks had aided appellant or had participated in any way in committing the crime for which appellant was being prosecuted. It was undoubtedly because of the absence of such evidence that appellant’s counsel sought to attack Spark’s credibility, not by showing that he was an accomplice, but by emphasizing his prior criminal record, which included convictions for burglary and theft and suggested possible motives for fabrication.
Not only was there no basis for an accomplice instruction, but such a charge would have been inconsistent with appellant’s defense that he did not set the fire but was elsewhere at the time of the conflagration. Under such circumstances, trial counsel cannot be deemed ineffective for failing to request an accomplice instruction. See: Commonwealth v. Johnson, 496 Pa. 546, 549-550, 437 A.2d 1175, 1177 (1981); Commonwealth v. Karabin, 493 Pa. 249, 252-253, 426 A.2d 91, 93 (1981); Commonwealth v. Quarles, 361 Pa.Super. 272, 279-280, 522 A.2d 579, 582 (1987).
Because of Supreme Court decisions emphasizing the need for a jury instruction explaining the defense of alibi, *358we hold appellant’s trial counsel constitutionally ineffective for failing to request an alibi instruction after relying upon alibi testimony to establish a defense to the charges against his client. In view of this dereliction, a new trial must be granted.
Reversed and remanded for a new trial. Jurisdiction is not retained.
FORD ELLIOTT, J., filed a concurring and dissenting statement. JOHNSON, J., filed a dissenting opinion in which KELLY, J., joined.. The Post Conviction Hearing Act has now been repealed and replaced by the Post Conviction Relief Act, 42 Pa.C.S. § 9541 et seq.
. O’Connor replaced Patrick Thomassey, Esquire, as defense counsel following a pre-trial hearing.
. Gainer was represented on appeal by John Elash, Esquire.
. It has been held, however, that a trial court need not use the precise language of Pounds, so long as the instruction given makes it clear that a defendant's failure to prove his alibi is not tantamount to guilt. See: Commonwealth v. Jones, 386 Pa.Super. 467, 563 A.2d 161 (1989) (en banc); Commonwealth v. Bright, 361 Pa.Super. 261, 266-267, 522 A.2d 573, 575-576 (1987).