Broadcast: Thursday 29th September 2011
4:30pm-5:00pm BST (15:30 GMT) < > « »
CBBC

Featuring: Daniel Anthony, Alexander Armstrong

Sarah Jane Smith and the gang open the Alien Files - the ultimate guide to everything you could possibly need to know when facing hostile aliens. Clyde has the lowdown on the all-controlling Berserkers and the alien truth behind the world's most famous painting - the Mona Lisa.