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The story begins with Sarah Jane and her friends chasing an overweight boy. After chasing him into a warehouse, it is revealed that he was a Slitheen woking with another family member in an attempt to use a matter compressor to squish Earth and make them rich. After Sarah Jane's Sonic Lipstick fails, 2 brown versions of Slitheen appear and teleport the Slitheen back to their ship. They then introduce themselves as the Blathereen, a separate, and according to them, law-obiding family of Raxacoricofallapitorius who were on a mission to track down and sentence all members of the Slitheen family.