Martin Freeman, Lewis Hamilton and The Great British Bake Off's Mel and Sue will add to the stellar line-up for BBC Children In Need's Star Wars sketch.
The BBC joined forces with Disney and Lucasfilm for the exclusive skit that will see Warwick Davis, C-3PO and R2-D2 seek out the biggest superfan in the galaxy to trigger the first totaliser on the fundraising night.
Along the way they'll be distracted by a host of celebrities vying for the coveted role, including Danny Dyer, Barbara Windsor, Stephen Merchant and Tom Daley.
The Voice co-stars Ricky Wilson and will.i.am will also make a cameo along with previously announced stars Lord Sugar and The Stig.
Formula One champion Hamilton said: "It's always a real privilege to be part of the BBC Children In Need campaign because I think the work they do is fantastic - kids are the future and that's why I love to be a part of it."
Other highlights of the night, which raises money to support more than 2,500 projects helping children in the UK, include a Call The Midwife Strictly Come Dancing special and performances from Rod Stewart, Ellie Goudling and Selena Gomez.
The sketch will air during the BBC Children In Need Appeal show on Friday November 13 from 7.30pm on BBC One.
Lewis Hamilton put what he described as "a difficult week" behind him to set a scintillating pace in first practice at the Brazilian Grand Prix.
He crashed his supercar in Monaco in the early hours of Tuesday and delayed his arrival in Brazil after a fever.
And he appeared below par during his media appearances on Thursday.
But the world champion was 0.519 seconds ahead of Mercedes team-mate Nico Rosberg, with Ferrari's Sebastian Vettel third, a further 0.106secs back.
Hamilton, who has said he is determined to win his first Brazilian Grand Prix this weekend, posted a statement of intent with his very first flying lap of the session at Sao Paulo's Interlagos track.
Rosberg set two consecutive laps in one minute 15.940 seconds and then 1:15.564, only for Hamilton to post a 1:15.102 on his very first flying lap.
Before practice, Lewis Hamilton was in high demand from the media, after revealing he was in a minor car accident in Monaco on Monday night
Later in the session Rosberg lowered his time to a 1:140.062, before Hamilton, who ran wide at Turn One after losing a front brake, produced his stunning 1:13.543.
He and Mercedes have been coy about what happened in the Monaco accident.
Hamilton initially was barred from discussing it, only to then tell British newspaper journalists that it was the "result of heavy partying and not much rest for 10 days".
The Englishman had a busy schedule following the Mexican Grand Prix and then celebrated his mother's 60th birthday in London on Saturday night before returning to Monaco.
"I am a bit run down," Hamilton said. "I have been non-stop and trying to fit training in at the same time and not getting a lot of sleep."
He has not explained why, if he was run down and lacking sleep, he was driving around the roads of the Monaco race track at three o'clock in the morning, nor said who was in the car with him.
Despite the difficulties, Hamilton has come to Brazil determined to end Rosberg's run of four consecutive pole positions and to win this race for the first time.
Behind Vettel, Red Bull's Daniel Ricciardo was fourth, using an upgraded version of the Renault engine, ahead of Ferrari's Kimi Raikkonen, who had a big spin after locking a wheel at Turn Four.
Red Bull's Daniil Kvyat was sixth, ahead of Williams' Valtteri Bottas and Toro Rosso's Max Verstappen.
Lotus reserve driver Jolyon Palmer, who is moving up to a race drive in 2016, was 12th fastest, just ahead of McLaren's Jenson Button, who was three places but only 0.034secs quicker than team-mate Fernando Alonso.
