Joe's grumpy Granpa has a very expensive computer with the latest computer mouse - a Megamouse. When Joe accidentally brings Megamouse to life, he's delighted - not least because it helps him to win all his computer games!But then Megamouse decides to explore the world outside with Granpa's pet rat Cleo. Soon they are both in terrible danger. Only Joe can save them...This is a new, revised edition of the original book which was acclaimed by reviewers:"Very funny" (The Observer)"A rollicking adventure complete with a Cruellade Vil-style villainess" (The Independent)