Hollywood actor Timothée Chalamet is set to bring some A-list mischief to this year's BBC Children In Need appeal, joining a host of stars and young fundraisers for the charity's annual live broadcast on Friday.

The Oscar-nominated actor, along with Dune co-stars Zendaya, Jason Momoa and Anya Taylor-Joy, will take part in a prank-filled interview with presenter Rylan Clark. The segment, filmed for their upcoming film Dune: Part Three, sees three children hidden behind the scenes helping to turn the tables on Rylan, leaving him flustered and confused.

A night of challenges and celebrations

The three-hour show, airing live from Salford, will be hosted by Alex Jones, Mel Giedroyc, Rylan Clark, Sara Cox and Tyler West. It promises a mix of entertainment and inspiring stories of young people overcoming adversity.

Among the highlights is Radio 2 presenter Owain Wyn Evans, who is completing a gruelling 400-mile cycle challenge across Scotland, Northern Ireland, England and Wales. On Friday, he will be joined for the final leg in Wales by 22-year-old Harri, who is living with the hidden lasting effects of a brain tumour.

Harri is one of four young people forming The One Show's "challenge squad," each undertaking personal missions for the charity. Zoe, 16, who has Down's syndrome, will dance with the cast of High School Musical; Ana, also 16, who has a rare physical condition, is doing a three-day kayaking challenge; and 22-year-old Serena will perform live in memory of her late brother and a childhood friend.

The theme for this year's appeal is Challenge Yourself 2026, encouraging supporters to take on their own fundraising feats. Morning Live presenters Michelle Ackerley and Gethin Jones have learned instruments to perform with a band live on the night, while Joe Wicks and Emma Bunton are among the other celebrities involved.

Landmarks including Blackpool Tower, the London Eye and Titanic Belfast will be lit in yellow to mark the occasion.

Last year's appeal raised more than £45 million to support children and young people across the UK. Children in Need funds over 1,600 local charities and projects, helping to change young lives.

The show will be broadcast on BBC One and iPlayer from 19:00 to 22:00 GMT on Friday.