Matt Smith had a plan for him and David Tennant to both continue in Doctor Who, according to Steven Moffat.
In an interview with the Radio Times, Moffat said: “They got on like a couple of old women. They just say in the corner and gossiped the entire time!”
"By the end of it, Matt told me that he’d worked out this plan that they’d both continue in Doctor Who: do five individual episodes each and three together – would that be okay? It was a nice plan. I think if I’d said yes they’d have gone for it."
However, Moffat admitted that neither Smith or Tennant had started out completely confident about bringing their Doctors together.
"David and Matt, I think… were both quite apprehensive of the other. David’s continued to watch Doctor Who like the sad old fan he is and so as far as he’s concerned Matt’s the Doctor. And of course for Matt, you don’t believe yourself you’re the Doctor, you just think David’s the Doctor. So they were both slightly nervous and slightly apprehensive."
Thankfully, they both quickly settled into an energetic dynamic that Moffat believes will thrill fans when the 50th Anniversary special hits screens in November.
"The double act between them is sublime," said Moffat. "It’s one of those happy accidents – there’s no reason why they should be, but they are absolutely adorable and hilarious together."
'The Day of the Doctor' will air in the UK on Saturday, 23rd November on BBC One, and will be simulcast worldwide on TV and in selected cinemas.