When Sarah becomes concerned that no one will save the world when she and the gang are not there, Mr Smith proposes creating a set of ĎAlien Filesí, cataloguing all the extraterrestrial menaces they have faced.
Clyde gets Mr Smith to 'pose' for a sketch, and in return he uploads more information into the ĎAlien Filesí.
File #5: Clyde recalls the time his dad was taken over by the amulet of The Berserkers, and then relates his encounter with the Mona Lisa.
Daniel Anthony (Clyde Langer), Alexander Armstrong (Mr Smith [Voice])
Directed by Pip Banyard
Senior Producer John Piper
Executive Producers Gillian Scothern and Russell T Davies
A CBBC production
8th November 2010 CBBC @ 5.45 pm
*Featuring Clyde and Mr Smith
*This edition features footage from 'The Mark of the Berserker' Part 1 and Part 2; and 'Mona Lisa's Revenge' Part 1 and Part 2