The series centers on a boy named Maxwell "Fantastic Max" Young who has adventures in outer space with two of his toys: FX, a pull string alien doll from a planet called Twinkle-Twinkle, and A.B. Sitter, a C-3PO-like android made of blocks. The show was developed by Judy Rothman and Robin Lyons from Siriol Animation as part of the creation of Kalisto Ltd. and the series was originally called Space Baby.