When Sam has cold feet about leaving her friends to join the NASA training programme, Dani and Jack must show her that she would be crazy not to follow her dream. Besides, however far away Sam is, they will always be her mates.

Zang and Zark must save the Earth from imminent destruction by the wicked Zorlok. They decide that Jack is the only one who can help, as they mistakenly believe he is Earth's mightiest champion. Meanwhile, Ruby must stop Max and Maisy from stealing Dani's new computer game. When Max and Maisy do manage to sneak past her, the last thing they expect to encounter is real live aliens.