There's an interesting premise in The Reincarnation of Peter Proud, but the film never becomes as interesting as the premise. Using the concept of reincarnation as a springboard for a murder mystery thriller has definite promise, but this adaptation of the Max Ehrlich novel works in fits and starts and never really finds it footing. As a result, Peter is one of those film that hooks the viewer at the start but which gradually loses him as the anticipated follow-up never really materializes. Peter is also very much a movie of its times, one that has a surprising amount of sex and nudity but that doesn't manage to come across as sexy or erotic; instead, those sequences are pretty boring. Peter also plays around with a lot of trendy ideas, tossing off some buzz words in the attempt to sound like it knows its territory but ending up rather naïve instead. In the title role, Michael Sarrazin is physically all that one could want, but his performance alternates between too strained and too uninvolved. Jennifer O'Neill and Cornelia Sharpe also look quite good but are only adequate as performers; however, Margot Kidder is excellent in a double role, even overcoming the curse of some very unrealistic "age" make-up.