Birthday Bear thinks the others have forgotten his birthday, and is sent to help a rich boy named Charles to celebrate his birthday. They try inviting Charles' schoolmates, which doesn't work as planned. The duo celebrates the birthday together, but it's not quite as fun. The rest of the family comes down to Earth, and they celebrate together, eventually winding up in a maze of thorns. Charles and Birthday Bear must save them; No Heart might have "divided and conquered" them for good.