It's Maria (Yasmine Paige), Luke (Tommy Knight) and Clyde's (David Anthony) first day at their new school – and something's not quite right. The food keeps going off, there's a funny smell in the air and the new technology block is hiding some dark secrets. The friends soon make a shocking discovery: evil alien race the Slitheen have disguised themselves as teachers as part of a deadly plan that threatens the future of the entire Earth.
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