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Inside the Spaceship is a 2 episode Doctor Who story. It is the third story in the first season, featuring William Hartnell as The Doctor.
Spoiler warning: Plot or ending details follow.
The Doctor, Barbara, Ian and Susan all appear to be acting strangely. Unexpected events are happening on the TARDIS, the travellers are becoming suspicious of each others motives, and the Doctor even accuses Ian and Barbara of sabotage. Fearing that they have been taken over by some alien force, he drugs them and attempts to explore the problem without interference.
Gradually it becomes clear that the series of strange events are an attempt by the TARDIS itself to warn them that something is wrong. The Doctor traces the problem to a broken spring, and correcting this brings all back to normal. The Doctor is forced to do what he least enjoys - apologise, and admit that he was wrong.