This week's guests are Martine McCutcheon, Les Dennis, Alison Hammond and Tom Courtenay.
Georgia Taylor, Bill Roache, Konnie Huq and Kevin Whately join Harry Hill.
Krishnan Guru-Murthy, Stephanie Beacham, Pam Ferris and Tom Allen are the guests on this episode.
Harry Hill is joined by Pam St Clement, Chelsee Healey, Chris Packham and The Krankies.
Jennie Bond, Nick Helm, Angellica Bell and Patrick Mower must find clips, people and anything that is fun or funny enough to save the world.
Helping Harry Hill fill the fun capsule and prevent an alien invasion this week are Hollywood actor Warwick Davis, gardening expert Charlie Dimmock, TV presenter Kelly Brook and children's TV presenter Sarah Greene.
This time Josh Widdicombe, Amanda Barrie, Samantha Womack and Michael Buerk help Harry Hill save planet Earth from a potential alien invasion.