Contestants include former footballer Troy Deeney, TV’s The Traitors winner Harry Clark, drag artist and DJ Bimini, and musicians like Lucy Spraggan among others.
“We’ve been wanting to come home, as we call it, for a long time, because the fact that they’re just in Wales is a test in itself,” said Billingham.
“You can have four seasons in one day.
“It sounds exotic to go to New Zealand and Australia and all these places.
“But it was great to come home. It offers everything we want,” he told Lucy Owen on BBC Radio Wales.
While one of the previous series of the non-celebrity version of the show was filmed in Wales, it is also the latest location for the seventh series of the show with celebrity recruits.
Billingham would not reveal any spoilers but said contestants’ “true character” is exposed once they are are pushed to what they perceive to be their limit – and beyond.