Tommy Storm and the Galactic Knights by A.J. Healy
Earthling Tommy and his four Milky Way friends are Galactic Knights - on a mission to save the Universe from pending destruction. Time is running out and the knights have many challenges in their way: they face the dreaded Beast of Hellsbells, must resist the allure of fame on an intergalactic gameshow and escape the deathly intents of the sherbet-addicted Nack Jickelson and the suicidal Chocolate Terrorists.
All the while evil mastermind A-Sad-Bin-Liner is planning to unleash his plot of mass destruction and Tommy will be forced to choose between his friends and his ambition, between the universe and his own life.