Alex wants Grandad home from hospital 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. Alex and Cat struggle to keep The Warrior under control as they head through the winter streets to rescue Grandad, defeat the Skarg, conquer Karaoke and explain carol singing, all on one hectic and exciting adventure. Alex and the Warrior is a quest full of magic and danger, music and laughter: Dickens meets The Terminator in this modern fairytale for all the family.