Trini returns from the desert. She gets in her first segment of the week, visiting the University of Tennessee, where an ape named Chantek learns sign language. Trini also checks out a giant telescope in Puerto Rico intent on picking up sounds from the galaxy. Different Mummenschanz performers theorize the way alien beings might communicate. In the workshop, everyone listens to the soundtrack of ""Earth Sounds,"" sent aboard Voyager I in 1977.ANIMATION: Robots from outer space observe what they think are human beings.THE BLOODHOUND GANG: ""The Case of the Dead Man's Pigeon,"" a one-shot adventure in which a lawyer is trying to swindle a niece from her inheritance.