Busy at work in the attic, Sarah, Luke, Rani and Clyde perform a series of checks with Mr Smith; all that is left to be done is to reactivate the Energy Reversal Beam. However, before Sarah can pull the lever to do so, the whole attic begins shaking as some alien force locks onto the house.

Suddenly a short man, dressed in a business suit and bowler hat, teleports into the attic. He is a representative of the Galactic Alliance, sent to reward Sarah Jane and her friends for their good work. (An unexpected event even for him, he was in the middle of a round of golf with Bruciefrax and Tarbyron). He introduces himself as Ambassador Ranius – Rani for short. The human Rani explains that that is also her name, he laughs:

“What a hoot! ‘The Two Ranis’.”

He presents them with their gift – red deely boppers – then hangs up his hat and takes a seat. He is about to recall a story to them about the fork handles (or is that ‘four candles’?) in the Galactic Canteen when he is suddenly overcome by a bout of flatulence. He dismisses the various noises as the creaking of the chair but the others are not convinced, for they have met aliens with gas problems before – the Slitheen.

The Ambassador claims he is not one of them, but when K-9 teleports into the attic to warn his friends of an intrusion, he is exposed. To silence the computer he teleports a clamp onto K-9 and deactivates him, before unzipping his forehead and revealing his true form. Sarah orders him to go but she and the others are rendered rooted to the floor when their deely boppers – really booby traps – paralyse their legs.

The Slitheen reveals his intention to steal K-9 and use his vast databanks to commit crimes throughout the cosmos. As he laments his plans, Luke tells Sarah Jane that they must activate the Energy Reversal Beam. Clyde assists by grabbing the Ambassador’s hat and throwing it at Mr Smith’s console, activating the beam and allowing Sarah to use her Sonic Lipstick to deactivate the deely boppers, paralyse the Slitheen and reverse the teleport that brought him to the attic.

“And it’s goodnight from him”.