"It's Marvin's turn to look after Nibbles, the classroom hamster. He's determined to show his grandad that he's responsible enough to have a pet, but disaster strikes when Dr Boom shows up with his latest invention and makes the hamster HUMONGOUS! It's time for Marvin to get into his super-suit and become MARV - unstoppable, invincible, and totally marvellous! Only then can he put an end to Dr Boom's mischief and rescue Nibbles!"--Back cover.
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