“It’s gonna be the most Christmassy Doctor Who ever!”

This is what “Doctor Who” executive producer Steven Moffat promised.

Moffat told The Telegraph: “Obviously we hammer Christmas quite hard in the opening few minutes and then we just get on with it. But it is Christmassy in the sense that it’s a sort of funny, fast, madcap chase episode with the Doctor and a big robot… and River.”

These are what we know so far on the “Doctor Who” Christmas special episode.

River Song meets the Doctor 

In an interview with BBC, Moffat said the meeting between the Doctor (Peter Capaldi) and River (Alex Kingston) will be so much fun since she has never seen the Twelfth Doctor’s face before. River also does not even know about the incarnation.

“I knew it had to be a big romp for Christmas day and there’s nothing like River Song to make that evident – River brings a whole storm of camp glamor to it,” Moffat said.

River’s New Husband

The Christmas special, titled “The Husbands of River Song,” will also show River’s other husband. In a trailer, she introduces the Doctor to her spouse (Matt Smith), and he doesn’t seem to like the new guy, the International Business Times noted.

King Hydroflax

The Christmas episode poster revealed that the Doctor and River will face a robot. Inside it is King Hydroflax (Greg Davies).

There's nothing like #DoctorWho at Christmas.

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Moffat described King Hydroflax as “a very bad King, who as it turns out is mostly cyborg – in fact only his head has remained.” He added King Hydroflax is “a vicious, terrible and deeply stupid man and a dreadful tyrant.”

New Character

A new character, named Nardole, will be introduced in the show.

“The character of Nardole is played by Matt Lucas so you can expect a lot of laughs and pathos … He is, as ever, a hugely loveable personality, a little naïve, a little out of his depth and quite cosmic,” Capaldi told the BBC.

No New Doctor Assistant

The show has yet to cast the next traveling companion for the Doctor.

IBT quoted Moffat saying: “Obviously, we’ve just lost Clara so I didn’t want to go straight into a new companion, and it’s not right to set that up at the end of a series where you’re all exhausted.”

The “Doctor Who” 2015 Christmas special airs on Friday (Dec. 25) at 9 p.m. EST on BBC America.