James Corden says the return of Gavin & Stacey will be a “nostalgic joy-bomb”.
The comedy hit is returning to BBC One for a Christmas special and filming will begin in summer.
Corden, who created the sitcom with co-star Ruth Jones, 52, said he had to resurrect it once they had an idea for a reunion, even if it doesn’t live up to expectations.
He said: “We owed it to the characters. Let’s see what they’re doing.
“We wanted to see if there was something there. Once there was, my feeling was, life’s too short.
“Fear is the absolute reason to do it. This sounds ridiculously deep but none of us are promised tomorrow. We’re here for a minute, you have to try to do it all.”
Asked if current affairs such as Brexit will be the subject of debate in the sitcom, he told Culture magazine: “We did talk about it.
“But we just want the new show to be a nostalgic joy-bomb.”
Corden, 40, who fronts The Late Late Show in the US, also said he would “never” reveal what happened on the mysterious fishing trip on Gavin & Stacey.
The show starred Mathew Horne, 40, and Joanna Page, 42, as a loved-up Essex boy and a Welsh girl who used phrases “well lush” and “tidy”.
The 2010 finale was watched by more than 10.2 million viewers.
Corden, who hosted this year’s Tony Awards, and Jones will return to their roles as Smithy and Nessa, alongside the other supporting cast – Rob Brydon, Larry Lamb, Melanie Walters and Alison Steadman.
Gavin & Stacey aired over three series, plus a Christmas special, from 2007 to 2010 on the BBC.
It told the story of Gavin (Horne), from Essex, and Stacey (Page), from Barry in Wales, who fell in love and married after speaking on the phone to each other every day at work.
The 2010 New Year’s Day finale was watched by more than 10.2 million viewers.
Corden, who is a huge hit in the US with The Late Late Show, is seemingly loved and hated in equal measures back in the UK and has had to put up with abuse on social media in recent months.
Asked how he feels about criticism, he added: “It really depends how you feel that day.
“Some things will be water off a duck’s back, others might bruise. It depends where you are emotionally.
“Also, it’s a strange time to be doing anything [in public].
“People are angry and, while it’s easy to criticise, it’s hard to have an idea.
“So my answer is, don’t waste your time being angry — have a better idea. And if you can’t? Think carefully about the next time you write that.”