Slartibartfast shows Arthur the archive tapes of Deep Thought being given the Search for the Ultimate Answer and of the result reported by the computer seven and a half million years later. After learning that the Earth was set up to search for the Ultimate Question, Slartibartfast and Arthur join Ford, Trillian, Zaphod, and Trillian's mice, who had guided them to Magrathea.
The mice dismiss Slartibartfast, then express their desire to determine the Ultimate Question by first extracting Arthur's brain. While the mice attempt to strike a deal, the galactic police arrive, and Ford, Arthur, Trillian and Zaphod flee the dining hall, only to be cornered by the police in a large bay. After a misunderstanding, the police open fire on a computer behind which the four are hiding, causing it to explode and ending the episode on a cliffhanger.