Romesh Ranganathan is in the guest announcer booth, while Cat Deeley is in the studio for one of the riskiest Undercovers ever as Ant and Dec wreak havoc on their former SMTV Live co-star. After 20 years, the trio also reunite with a whole host of celebrity pals for the return of their much-loved sitcom Chums. Plus, Stephen Mulhern is back for another sporting challenge and a member of the virtual audience gets the chance to Win the Ads.