Alex wants Grandad home from hopstial for Christmas, so he makes a foolish wish. In spite of Cat's warnings, he asks his favourite computer game character to come and help. But when The Warrior steps out of the screen, with a large sword and a lot of attitude, Alex begins to wonder what he's let himself in for. The Warrior's deadly enemies, the Skarg, soon follow, trying to fit in as human beings in a world they don't really understand.