Giant diamond

The Giant Diamond is what Martians traded their land for. Leo and Inez Wong's ancestors gave it to them to get the Occidental Hemisphere of Mars. Many generations later, they assume it is a worthless bead, so they wanted their land back. So they kidnap Amy, which Kif Kroker, Fry, Leela, Bender and Zapp Brannigan teamed up for a rescue mission. But when the Martians saw Kif flying a Buggalo, he was taken to smoke the peace pipe, unfortunately, Kif was not a big smoker, and coughed "at their offer", and the Martians wanted to kill him with the "bead", upon which everyone realises it's a giant diamond. The Martians decided to forget their land and scape to look for a new planet.