Barrowman is most known for playing the character Captain Jack Harkness in the television series "Doctor Who" and "Torchwood". He is also a famous musical actor and singer. He has appeared in many musicals, as well as television shows about musicals. He also has been a presenter for series such as "Live & Kicking and, the Hollow Earth trilogy". He is currently staring in CW's Arrow as Malcolm Merlyn.