The Goodmans must face a crisis of culture and Dad's mum - aka 'Horrible Grandma' - in the new episode, and we're sure that oddball neighbour Jim (Mark Heap) will be popping his head round to spread some festive cheer!
Digital Spy caught up with quick-witted Tom Rosenthal - who plays Jonny - to talk Christmas specials, romance and unlikely Hollywood on-screen pairings...
What hints can you give about the Friday Night Dinner Christmas special?
"We get a visit from Horrible Grandma, who as you probably tell from the name is really nice! No, she's horrible, we all hate her - she's got a horrible face and a horrible dog.
"What else? Everyone gets presents - there's a slight crisis of culture as they are a Jewish family celebrating Christmas and there's all of the ideological and theological issues that arise from that - not like a debate, it is funny!
"So yeah, everyone gets presents, they get a Christmas tree... y'know, Christmas s**t."
So Horrible Grandma has a horrible dog?
"Yeah, she's got a horrible dog - it smells really bad and has an oxygen mask to keep it alive."
Should we expect some kind of face-off with Wilson?
"Erm... you could say that - that's very perceptive of you. Yeah, let's call it a face-off!"
We've heard that this might be a more emotional episode of Friday Night Dinner than we've seen before?
"We've made an effort to give it some heart. Poor old Jim's always been a bit of a lonely figure at Christmas. Mark gave it a little emotional turn... I wouldn't want to give it away.
"But it's always a bit of a gamble, isn't it, for comedy shows to be emotional? I've seen it done well and I've seen it done badly, I've yet to see the Christmas episode myself, so I don't know whether we've succeeded or not!
"But yeah, there's some heartstring pulling, so... get out the Kleenex or whatever you say. I can't imagine people will be tearing up at Friday Night Dinner, but we'll see. We'll try!"
What were some of your most memorable moments from series two?
"There's several - I guess me and Simon [Bird, who plays Adam] were beating each other up quite a lot and I had a proper knackered knee - a couple of times I just collapsed screaming in agony which is quite good for British sitcom! Simon going in the water on a freezing night in Enfield made me very happy...
"Jim threw a plate at the wall, dangerously close to my head! I was just s**tting myself - Mark Heap threw a plate at my head, he's quite a big man - quite a threatening silhouette - and he's throwing a plate at my head. So that was probably one of the most memorable moments!"
There was also the sequence in the last episode where Jim was coated in red paint...
"We couldn't laugh when that was happening because obviously you don't get many takes with something like that, but when it went over his glasses and he wiped his glasses, that was an incredible sight. That was memorable, certainly!"
Series two seemed a little broader with the family venturing out of the house before. Did it feel that way filming it?
"Absolutely - when you read the scripts, there was just more comedy in it and as a result I think there was more corpsing and more laughing during filming it. I guess because bigger things were going on.
"It was a conscious decision, and people responded well to it. I've been out of the country when it's been on TV so I didn't get the reaction, but from what I've heard people enjoyed it more than the first series."
Jonny hasn't had much luck with women – first there was his fictional girlfriend, then his boss. What kind of girl would be right for him?
"Oh, just a vacuous, pretty one with big boobs who reads Nuts – no, not Nuts, what do they read? One who wears too much hairspray and has lots of eye makeup and who can deal with Mum...
"If he had a real girlfriend, he wouldn't bring her around, would he? He'd drive her around in his weird house car and show off about all the different dance music he knows and likes."
Do people approach you a lot to talk about Friday Night Dinner?
"Yeah. I live in North London, but in real life, I don't wear my Topman suits, so luckily I'm not getting accosted constantly. But a few people have been really kind...
"I wouldn't say I'm getting mobbed. There's not hordes of screaming teenagers chasing me down the street, but it's been pleasant! I keep seeing my own face on the street and I keep laughing at it. Walking past adverts and laughing... which is strange behaviour."
There's been talk of a Friday Night Dinner US remake, and Mark Heap told us that he wants Robert De Niro to play Jim. Who would be your pick for a US Jonny?
"Morgan Freeman - I think he would smash it. He's a very funny actor and could bring his incredible grandeur and status. I don't know actually - maybe Morgan Freeman, or maybe Pamela Anderson."
Pamela and De Niro would be dynamite...
"On-screen gold. Not sure Channel Four could quite stretch the budget."
Have you heard anything about a possible third series of Friday Night Dinner?
"Afraid not, no. I'm meeting with Robert next week to chat about that sort of stuff, but right now I'm completely ignorant. If you could let me know if you hear anything, that would be great! I need to put it in my calendar if we are doing another one."
What would be your dream storyline for Jonny if a third series did go ahead?
"Honestly, anything I could come up with would never be a patch on what Robert could conceive of. Purely from an actor's point of view, I want storylines that keep Jonny inside, warm and generally in bed. If I could do any scenes that would just involve me being asleep, that would be gold. Anything outside or where I'm standing up... I'm really not a fan of."
Is television a big thing for you at Christmas - do you tune in for festive TV specials?
"I've always watched Christmas specials. It's amazing - even more mind-blowing than having an advert of your face on the Tube - to think I'm going to be in a Christmas special because it's kind of the only thing I like about Christmas.
"I've never been a massive Christmas fan. Obviously it's nice to see Grandma, sure, but I love The Office Christmas specials and The Royle Family Christmas specials – for want of a better word, they're very special.
"To have a Christmas version of Friday Night Dinner - I can't wait. I've not seen the episode yet. I'm saving it for Christmas because it will be so special to watch it with my family and go, 'Yeah, that's me - well, kind of me, in a way'."
I have to ask about your new ITV2 sitcom Plebs - it's about slaves in Ancient Rome. Sounds like a crazy concept...
"That's where I've been for the last seven weeks. It would be fair to say it is quite a big idea. Quite a high concept. Rome was shot in Bulgaria - it was incredibly real life, the sort of effort and skills of [the] arts department and the costumes... it's kind of mind-blowing.
"I just can't wait to see how it's all put together. I know it all looked amazing, but I don't know if it was funny - I hope it was! But every day I was just totally blown away by how incredible it all looked. There were loads of extras - loads of Bulgarians and bloody horses and carts and naked people and crazy old ladies with one arm... I really think it could be something very special to watch. I'm very, very excited to see how it comes out.
"It's not often you see something like that. We're so excited about it - I know I've never seen a show that attempts to be like this, in terms of other sitcoms. Who knows? It is exciting - really exciting - to be part of it. We'll see."
The Friday Night Dinner Christmas special airs on Channel 4 on Monday, December 24 at 10.30pm.