He is the Ambassador of Decapod 10, Zoidberg's home planet, to Earth. When Zoidberg ate the Earth's flag, he was chased by an angry crowd to the Decapod 10's embassy. After Zoidberg's Supreme court trial, in which he was sentenced to death, the army tried to seize the embassy to arrest Zoidberg. In revenge Mervin sent Decapod fighter ships enslave Earth. During the battle, he sent Zoidberg to steal the codes for Earth's global defense system, which leaves Earth unable to fight off the invaders and lose the war. Mervin forced the humans to build The Mobile Oppression Palace, a massive robot which could be used to enforce their rule on Earth instead of costly fighter ships.