The Seventh Doctor was portrayed by Sylvester McCoy during the last years of the classic series: from 1987-1989, when the show was cancelled. He made his final appearance 7 years later in the 1996 Doctor Who TV movie, when he regenerates into Eight.
Seven was intelligent, cunning, and manipulative. As Seven, the Doctor destroyed Skaro, the Dalek's homeworld. Nevertheless, despite Seven's manipulative streak, he was still cared greatly for his companions and the well-being of the universe, using his complicated gambits generally for good.