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.
Luke returns from university with his washing, prompting Mr Smith to suggest incinerating such a biological hazard. Ignoring the jibe, Luke follows his mumís instructions to upload more information into the ĎAlien Filesí.
File #3: Luke recalls his connection with Mrs Wormwood and the Bane, and his encounters with the Sontaran Commander, Kaagh.
Thomas Knight (Luke Smith), Alexander Armstrong (Mr Smith [Voice])
Directed by Pip Banyard
Senior Producer John Piper
Executive Producers Gillian Scothern and Russell T Davies
A CBBC production
25th October 2010 CBBC @ 5.45 pm
*Featuring Luke and Mr Smith
*This edition features footage from 'Invasion of the Bane'; 'The Last Sontaran' Part 1 and Part 2; and 'Enemy of the Bane' Part 1 and Part 2