The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a living—more of a hobby actually, and the Doctor's very, very good at it.
Star Trek: Enterprise
Planet of the Apes
Mirror, Mirror II
Shouga Dorama Oda Nobunaga
Captain Earth
Knights of Sidonia
Space Dandy
Bravest Warriors
12 Monkeys
My Love From Another Star