Opinion by

John Curry, Inc. appeals from a Workmens Compensation Appeal Board order affirming a referees decision awarding total disability compensation to William Adams. The boards order is affirmed.

According to the referees findings of feet, the claimant filed a petition on April 7, 1978, for an injury sustained on February 10, 1978. At the time of the initial áccident, the claimant was employed as a truck driver. He continued to work until March 10, 1978, when he fell on an ice embankment and reinjured himself while making a. delivery for the employer. Although the claimant returned to work on September 1, 1978, working three days per week, he had to cease work on November 20, 1978 because the continued work aggravated the March injury.

The employer raises three issues;* 1 however, in framing the factual issues, the employer has pursued an in *129 applicable standard of review. Where the board does not consider additional evidence and the party with the burden of proof has prevailed before the referee, the standard of review as to facts is whether substantial evidence exists to support the essential findings of fact. Montgomery Mills Co. v. Workmen's Compensation Appeal Board, 26 Pa. Commonwealth Ct. 471, 364 A.2d 508 (1976). Hence, the issues are: (1) whether the referees findings of feet are supported by substantial evidence, and (2) whether the board committed an error of law in failing to review the employers films.

The employer offered testimony before the referee that, although the claimants injuries justified restrictions on lifting, there were jobs available to the claimant. In addition, the employer submitted films “depicting a few of claimants activities.” However, the referee found credible the claimants testimony and the testimony of the claimants physician indicating that the claimant was totally and permanently disabled by his injuries suffered at work. The referee, as the ultimate factfinder,* 2 may accept or reject the testimony of any witness in whole or in part, and further, the referees decision to accept the testimony of one competent medical witness over another will not be disturbed on appeal. Borkowski v. Workmen's Compensation Appeal Board (John F. Kennedy Medical Center), 74 Pa. Commonwealth Ct. 310, 459 A.2d 1336 (1983). Consequent *130 ly, the record contains substantial evidence to support the referees finding that the claimant is permanently and totally disabled.

Although the referee viewed all of the employers films in their entirety, the board failed to obtain and view the surveillance films. This court has stated. that “[t]he Board cannot fulfill its statutorily mandated duty without having the benefit of the entire record.” Del Penn Steel Corp. v. Abrams, 8 Pa. Commonwealth Ct. 226, 229, 302 A.2d 875, 877 (1973). Moreover, this court has voiced its disapproval of the boards refusal to view such films. John B. Kelly Co., Inc. v. Davis, 8 Pa. Commonwealth Ct. 589, 594, 303 A.2d 255, 258 (1973). Consequently, where surveillance films are admitted into evidence without objection, constituting part of the record, the board commits an error of law in not viewing those films in its review of the entire record.

The issue remains whether the boards error in not viewing the films justifies a remand. When the record is incomplete, lacking evidence essential to a determination of the issue, the proper course of action is to remand. Marshall v. Workmen's Compensation Appeal Board (Gulf & Western Industrial Products Company, etc.), 79 Pa. Commonwealth Ct. 128, 468 A.2d 1164 (1983).

However, when, the record contains substantial evidence to support the referees findings, those findings cannot be disturbed on appeal. Here, the films were not essential to the boards determination that substantial evidence supported the referees findings of total and permanent disability. Because the boards substantial evidence determination precluded it from disturbing the referees findings, the boards error in not viewing the films in its review of the entire record was harmless. 3 Moreover, this court, in a similar case in *131 which the board refused to view films, affirmed the boards decision based on “the fact that the Board had the benefit of a running narration óf the films by the [employers] investigation on the record.. From this, some review of the films though limited could be afforded.” John B. Kelly Co., Inc., 8 Pa. Commonwealth Ct. at 594, 303 A. 2d at 258. In this case, the employers investigator testified before the referee as to the contents of the films, giving a narration of the films as they were being shown. Consequently, record evidence concerning the content of the moving pictures was before the board.

Accordingly, the boards order is affirmed.

Order

Now, May 7, 1986, the order of the Workmens Compensation Appeal Board, No. A-86215, dated November 8, 1984, is affirmed.