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SWITCH is the Serum Which Instigates Total Cellular Hijack. The serum which can turn you into something else. Invented by Petty Potts – a crazy scientist who also happens to be Josh and Danny’s nutty next-door neighbour! Soon Josh and Danny are changing into all sorts of creepy-crawly critters. But they’re no longer top of the food chain, and it’s a big bad world out there… Follow their adventures as they transform into spiders, ants, pond beetles and revolting flies. Can they stay alive – AND escape the clutches of the sinister Victor Crouch, who wants to steal their precious knowledge? Cool adventures from a Blue Peter Book of the Year Award winner!