Dr Liam Neesam returns and declares himself to be Scoochie, the author of the love letters Mary has received. He reveals nefarious plans for Earth. Meanwhile Sally, Harry and Tommy discover there is a prequel to their favorite movie.

The Solomons struggle with the news the mission is cancelled and they must return to their home planet. They hold a party to say farewell to all their friends on Earth. Elvis Costello entertains at the Solomon's going away party.