David Tennant and Billie Piper have a hilariously dark theory about the Doctor and Rose’s relationship

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Well, according to Piper and Tennant themselves it most certainly was not, with the duo revealing their own theories about Rose and the human Doctor’s future life when the actors reunited at Wizard World con over the weekend.

Asked whether the pair could have had children, Tennant initially responded incredulously.

“What do you think – was that biologically possible?” he asked the crowd, who enthusiastically replied in the positive.

“Well then, apparently they DID have a family,” he laughed. “The hall at this particular comic-con has decided.”

Turning to Piper, he asked: “How many kids did they have?”

“Hmmm… maybe…. two?” she suggested. “They’re quite self-involved, anything more would’ve [been an issue].”

“Jackie’s probably bringing them up,” Tennant said, before whipping out his own impression of actor Camille Coduri, who played Rose’s mum in the series from 2005 to 2010.

“Yeah, she would be one of those really smothering mums,” agreed Piper.

“I think they would’ve had a couple of kids. Have a few dogs. Maybe a lizard on a lead! He’d like weird pets.”

All sounds fairly idyllic so far – but then things took a darker turn.

“They’d have slid into alcoholism…” Tennant joked, with Piper continuing: “and died of boredom.

“You wanna see that, right?” she asked the crowd.

Frankly, at this stage we wouldn’t be surprised if a gritty kitchen-sink drama starring a half-human Time Lord and a former time traveller ended up being the sleeper spin-off hit the BBC has been looking for. And if not, well, Tennant had a suggestion for what fans could watch instead to get a sense of the pair's future lives.

“Have you seen the sitcom the Royle Family, the British show?” he asked. “No? Oh, that’s not gonna work.”

“I have, and I get it,” Piper assured him.

And if nothing else, this is a whole new avenue for the fan fiction writers to explore. Rose and the Doctor hit the bottle? Finally, the drama we’ve been waiting for.

Doctor Who returns to BBC1 this autumn