On an overnight trip to the museum, Fangbone and Bill discover a Skullbanian relic that transforms a mural into a gateway to a Skullbania-like world. It’s exactly what Fangbone needs to cure a bout of homesickness! But when a Razor-worm escapes into the museum and cocoons his classmates, Fangbone faces a tough choice – to save his friends he must smash the relic and lose this connection to home forever.