First Ferris Foster's dog got famous, and then his school did! He's ready for normal life again, that is until his new foster brother Arthur arrives:The boys couldn't be more different: Arthur is OBSESSED with space, whereas Ferris has more down-to-earth hobbies, like rating crisps out of 10.Arthur's going to spend half-term at camp, giving Ferris the time (and space) to draw the best cartoon ever and win a grand cash prize that could change everything.On top of all that, Ferris and his mums are preparing for a nerve-wracking interview which will decide if they'll finally become his foster-sister Keely's forever family.But when the Fosters drop Arthur off at Camp Space-Tacular, he has a SUPERNOVA of a meltdown and doesn't want Ferris to leave! Can Ferris help Arthur, draw his competition-winning comic, and convince Keely's social worker he's the perfect big brother, or are his plans just too astronomical?!