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The pair recently starred alongside each other in the Doctor Who Christmas special when Captain Jack and Alonso Frame met for the first time.
Speaking to Doctor Who magazine, Barrowman described Tovey's character as "the perfect companion" for Jack.
"What I'd love, what I think would be great, is if Midshipman Frame became Jack's companion in Torchwood. He's the perfect companion for Jack.
"It'd be like Batman and Robin. Of course I'm Batman. He's Robin."
Torchwood third series, which aired in July last year, saw fan favourite Ianto Jones killed off in the penultimate episode, leaving just Captain Jack and Eve Myles's Gwen on the team.
> Barrowman, Tovey 'have great chemistry'
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