Eddie's fears come true when he crosses a bridge and is followed home by a mischeivious bridge troll. Luckily Eddie's best friend Sheldon, a member of a weird society called 'Jr. Monster-Buster,' knows what to do. However, the situation turns from bad to worse when Eddie's disbelieving, older brother is kidnapped by the troll.

An unscheduled detour takes two surfer dudes to Transylvania, where they end up riding a midnight express train... that's populated with vampires and other fiendish foes. Soon the boys find it hard to distinguish between their friends and enemies.

When brothers Richard and Stephen improperly dispose of the toxic waste from their failed Science Fair Project in a nearby bog, it comes back to haunt them in the form of a Bog Blob.