Helping Harry Hill fill the fun capsule to prevent an alien invasion in this episode are comedian Micky Flanagan, political journalist Robert Peston, Coronation Street actor Sally Dynevor, and broadcasting legend Anneka Rice.

Helping Harry Hill fill the fun capsule tonight are comedian Tom Davis, Casualty actor Suzanne Packer, EastEnders star Kara Tointon and legendary newsreader Moira Stuart.

Helping Harry fill the fun capsule in this episode are comedian Johnny Vegas, singing legend Jimmy Osmond, Emmerdale star Samantha Giles and national treasure Sue Johnston.

Helping Harry in this episode are Rizzle Kicks singer Jordan Stephens, broadcaster Janet Street-Porter, star of The Last Leg Alex Brooker, and legendary actor Una Stubbs.

Helping Harry Hill fill the fun capsule are actor Gaynor Faye, Countryfile's Anita Rani, Professor Robert Winston and comedy legends Cannon and Ball.

Helping Harry Hill fill the fun capsule and prevent an alien invasion this week are TV chef Rosemary Shrager, Radio 2 DJ Liza Tarbuck, former Doctor Who star Peter Davison and X Factor star Louis Walsh.

Helping Harry Hill fill the fun capsule are EastEnders actor Charlie Brooks, Holby City star Chizzy Akudolu, comedian Lolly Adefope and Countdown legend Carol Vorderman.

In this 'Unseen' episode, Harry Hill reveals some of his favourite funny moments that didn't make it into the main series, featuring Johnny Vegas, Jimmy Osmond, Anneka Rice and Micky Flanagan among others.