Ambassador Mervin is the antagonist of the Futurama episode "A Taste Of Freedom"
He is the Ambassdor 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, whixh 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.The Planet Express crew went to musem with an weapons display, hoping to find a weapon that wasn't shut down during the invansion. They find a heat seeking missle from the 20th century andfire it at the place, hoping to destroy it. But the missle could not hit it, as all Decapodian technology was cold bloodied.
Zoidberg then realized his mistake in enslaving Earth, particulary after Mervin callously crushes the lawyer who had previously defended him in his trial when said man acts in defiance, and lit a Earth flag on fire and threw it at the Palace. This allowed the missle to find it's mark and blow it up, freeing the Earth and making Zoidberg a hero. It is unknown what happens to Mervin after the episode, but it may be possible he returned to the job.