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The actor, who will return to the role of Captain Jack Harkness in the latter part of Doctor Who’s third season, told the Daily Record: "David [Tennant] is a bit more fun and he laughs a lot more, while Christopher [Eccleston] was very serious."
"David and I have socialised prior to working together,” added the star, who is currently filming the second season of spin-off show Torchwood. “When he comes back to Torchwood, the only thing I can tell you is that, without giving too much away, Jack will not be as angry or as dark this time. He's a bit more fun than he was before."
The Any Dream Will Do Judge also explained the diverse dynamics for him in both shows: "It's different because when I go back into Doctor Who, I'm one of three, whereas in Torchwood, I'm No. 1. When I go back to Doctor Who, I have to readjust and do things differently because Jack is not the leader, he's just part of a team. Jack is the brawn in that organisation, whereas in Torchwood, he's the brain and the brawn."
