“A much underrated and seldom revived film...told from the schoolboy's viewpoint.... With Goodbye Mr. Chips coming in between, The Guinea Pig, from the same company that made The House Master, presents a decidedly different and less happy post-war view. It's the story of a working class boy experimentally being sent to a ‘high class' school. With class distinctions so much a part of British life...British films very democratically had no qualms about making films on themes of class distinction. But since most of the key filmmakers came from higher-education backgrounds, they tended to perpetuate the class-distinction myths rather than demolish them.... Richard Attenborough is so sullen here that one can't altogether blame his classmates for taking a dislike to him.... So The Guinea Pig is interesting on two levels. It is a piece of first-class theater...but it's also an unwitting and socially valuable mirror to conditions and attitudes that were supposedly changing but in reality weren't. The cast is extremely solid....” William K. Everson