Glasgow, 1972. All the coolest kids in town are lining up for Led Zeppelin tickets. Overhead, a Zeppelin approaches. Its passengers--Jimi Hendrix, Janis Joplin, and Hank Williams--think it's worth leaving heaven to see the greatest rock band in the world. Even the fairies are fans. Meanwhile, nerdy Martin and his equally nerdy best friend Greg have overactive imaginations. When they aren't fighting the monstrous hordes of Xotha, they are competing...