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Doctor Who boss Steven Moffat says the Timelord will become a “different man” when he is joined by new companion Jenna Louise Coleman.

Sexy Jenna, 26, had a cameo appearance in Saturday’s opening episode but will not return on screen until Christmas as Clara, Matt Smith’s new sidekick.

Moffat thinks after the loss of old companion Amy Pond, the Doctor will have changed a lot.

Writer Moffat said of the Doctor: “He becomes a slightly different man. He dresses differently.

“We are going to do the story properly of the Doctor having lost a friend and making a new one. We’re not taking that lightly.”

Speaking to SFX magazine, Moffat also suggested that losing Amy, played by Karen Gillan, would have a big emotional effect on the Doctor and make him less upbeat.

He added: “It’s not in one door out the other. It’s the story of how all that affects him, why he engages with somebody else and what’s going on with that - that’s all important.

“The Doctor is quite different with her, and the way you watch them is quite different.

"You watched the Eleventh Doctor and Amy arrive together.

“It’s like they grew up in the same sandpit, playing.

"They felt not quite like equals - the Doctor never feels like an equal to his companion - but you knew them equally well and they were equally important to each other.”

Doctor Who came back on screen on Saturday with 6.4million viewers.

More than a million people have already watched the episode online on the BBC’s iPlayer since the weekend.

This weekend’s episode is called Dinosaurs On A Spaceship and sees the Timelord up against the prehistoric animals.