The last thing Will is expecting when he embarks on a geography field trip to Wales with his schoolfriends is an exciting, action-packed adventure. But what is waiting for him on the misty Welsh mountains is a lot more exciting than the landmarks their geography teacher Mr. Frobisher has in store for his pupils...

After Will falls and bangs his head along their walk, he comes to, surrounded by an interesting cast of characters - Mavis, a lady dressed entirely in black silk, Drych, a blue Welsh dragon (don't ask him why he's not red), and the disembodied cockney voice of Spiv. Their spaceship has crashed and only Will can help the stranded threesome out. He finds himself having to pilot an alien spaceship across the galaxy to capture a pair of intergalactic criminals...

The crew on his spaceship have various unusual talents that help the friends' adventure, but none of them can actually fly the spaceship without Will's help. However, things don't go exactly to plan, and before long the tables are turned, with the criminals chasing them! As their troubles multiply, Will again finds himself separated from the group - and this time he is the only one with a chance of rescuing his new friends...