Being from the fourth dimension is... interesting. Two kids, Cassie and Larson, are born living normal lives when they realize they aren't normal. Larson is unconventional and rude to anyone unworthy. As for Cassie, well, she just wants to have fun and enjoy herself.

Cassie and Larson both have the want to find out what they are, they join together to find anyone else who's like them. Others join and help them along the way with the same goal in mind: understanding who and what they are in this complicated thing they call reality.