Trillian is an intelligent young woman who is the sometime girlfriend of Zaphod Beeblebrox. She leaves Zaphod in the course of the story and winds up traveling with Slartibartfast, Arthur and Ford. Trillian is the first to determine that the people of Krikkit have been manipulated by the supercomputer Hactar and convinces them to stop their obsessive mission to destroy the universe.
