In the TARDIS, Ben and Polly witness the First Doctor collapse and transform into the Second Doctor who seems to ignore or deliberately misunderstand direct questions, and refers to his previous self as another person. Ben suspects he is an imposter, but Polly is willing to believe he is the Doctor. They land on the planet Vulcan, where the Doctor witnesses the murder of an examiner from Earth, sent to inspect the planet's colony (why the examiner was summoned is a mystery). The Doctor, using the dead man's badge, pretends to be the examiner. A security team, led by Bragen, escorts the Doctor, Ben and Polly to the colony, where they meet the governor, Hensell, and his deputy Quinn. There are indications of a rebel faction that Hensell does not take seriously.