Megan's world is turned upside down when she hears her calm life with her little brother and single mum is about to change. She hears she's soon to have a stepfather and a stepsister. Megan thinks they're a bit weird and is determined to stop the wedding. She discovers they're actually even stranger than she thought - they're from another planet.

Zenon Kar is 15 and lives on a space station which the military has taken over and is dismantling. She receives a mysterious signal and must convince everyone that it's from aliens who have come to help them.