Dani is convinced that Toby and Sam are planning to assassinate her.

Sam is on a sleepover at Dani's so she can revise for an important exam in peace - unfortunately this doesn't help Dani with her preparations for her Grease auditions. And with Ben on sleepover to redress the girl/boy balance, everyone is getting restless, and nobody is getting much sleep. Meanwhile, all of the action is being observed from on high by the aliens from outer space...

Due to Dani's 'Halloween humbug-ness', she refuses to take the boys trick-or-treating, so the gang try tricking her into becoming a Halloween believer. Who are they going to call - Ghostbusters?