Human Nature (Doctor Who)

"Human Nature" is the eighth episode of the third series of the revived British science fiction television series ''Doctor Who'', which was originally broadcast on BBC One on 26 May 2007. It is the first episode of a two-part story written by Paul Cornell adapted from his 1995 ''Doctor Who'' novel ''Human Nature''. Its second part, "The Family of Blood", aired on 2 June. Along with "The Family of Blood", it was nominated for the Hugo Award for Best Dramatic Presentation, Short Form in 2008.

In the episode, the alien time traveller the Tenth Doctor (David Tennant) hides from his pursuers, the Family of Blood, in a public school in 1913. He transforms himself into a human and implants the false persona of a schoolteacher called "John Smith" to avoid detection until the Family's life runs out. Provided by Wikipedia