David Tennant Should Return To Doctor Who, But Not As The Doctor

thegamer.com:

Remember when the 10th Doctor regenerated into his severed hand and said hand grew into a human version of himself? At the time, showrunner Russell T Davies was all, “Well shit, we can’t have two Doctors running amuck!” so they stuck him in a parallel universe? No? Well, neither does the show. It hasn’t come up since and not much has been done with it, but it left the door open for Tennant’s potential return one day. He could look older and be different to who he was, undergo a completely new arc, but perhaps more interestingly, there’s a motive for him to even become a villain. We’ve seen Tennant’s chops in Jessica Jones and Des - the man can be scary and unnerving when the situation calls for it.

We’ve seen the Doctor stranded before, and they don’t cope well with it, slowly unravelling until they up and leave for other adventures, sidetracked by the monotony. This duplicate Doctor can’t ever leave that parallel universe, so they definitely wouldn’t cope. And what’s more, he can’t regenerate, and he knows it. With how vain the 10th Doctor is - so desperate to cling onto his incarnation that he spawned a clone to keep his face and personality - you can imagine him with the ticking time bomb of mortality. Jealous of themselves, eager to become a Time Lord again, and born of genocide, this is a character that could rival the Doctor in a way even the Master doesn’t.

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The Doctor was stranded on Earth during his third incarnation, forced into exile by the Time Lords. He kept up his adventures by helping Unit but the frustration was felt, so much so that he became a whole new person when he began travelling amidst the stars again. We didn’t