The Second Doctor is a character from the British science fiction television series Doctor Who. Portrayed by actor Patrick Troughton, he first appeared in 1966 and served as the Doctor from 1966 to 1969. This incarnation is known for his playful demeanor, distinctive bowler hat, and recorder, which he often played to lighten tense situations. The Second Doctor's era introduced new companions, including Jamie McCrimmon and Victoria Waterfield. He faced various adversaries, such as the Cybermen and the Daleks, while exploring time and space. His tenure marked a significant shift in the show's tone, blending humor with adventure.