Timothée Chalamet and his Dune co-stars will be seen pranking Rylan Clark during this year's Children in Need on Friday.
The Oscar-nominated actor will be seen making the presenter sweat with suggestions from children behind-the-scenes in an Impractical Jokers-style set-up, during an interview with Zendaya, Jason Momoa and Anya Taylor-Joy about the third installment of the film franchise.
This year's Children in Need show will also feature Radio 2 presenter Owain Wyn Evans and a "challenge squad" of young people completing feats in the name of charity.
Last year's appeal raised more than £45m to help children and young people across the UK, and this year's TV event will be broadcast from 19:00 GMT.
The three-hour show will be hosted live from Salford by Alex Jones, Mel Giedroyc, Rylan, Sara Cox and Tyler West.
They will welcome Wyn Evans, who has been the latest Radio 2 DJ to put himself through a gruelling challenge for Children In Need, following in the footsteps of the likes of Sara Cox and Paddy McGuinness.
Wyn Evans is being joined on his final leg in Wales on Friday by 22-year-old Harri, who is living with hidden lasting effects of a brain tumour.
He is part of The One Show's "challenge squad" – four young people who have signed up for a series of personal missions for the charity.
The others are 16-year-old Zoe, who has Down's syndrome and who will be seen dancing with the cast of High School Musical, Ana, also 16, who has a rare physical condition and is doing a three-day kayaking challenge, and 22-year-old Serena, who will perform live in memory of her late brother and a childhood friend.
The theme of this year's Children in Need is Challenge Yourself 2026, which has also seen Morning Live presenters Michelle Ackerley and Gethin Jones learn instruments.
Joe Wicks and Emma Bunton are among the other stars who have been involved, while landmarks including the Blackpool Tower, London Eye and Titanic Belfast will be lit in yellow for the occasion.
Children in Need supports more than 1,600 local charities and projects across the UK.
Children In Need is on BBC One and iPlayer from 19:00-22:00 GMT on Friday
Children in Need support helps change young lives
Look North sofa push passes through West Yorkshire
Owain Wyn Evans feeling the pressure on penultimate day of his cycling challenge
Children in Need donations improve lives with osteopathy
Fox Style News Syndicate. Sourced from broadcast reporting: Read Full Source Coverage.