Lieutenant Kif Kroker is a recurring character, who is an undisclosed Amphibiosan alien of light green color from the planet Amphibios 9 on Futurama. He is also a member of the Democratic Order of Planets or DOOP, where he acts as lieutenant to the inept general Zapp Brannigan. He fell deeply in love with Amy Wong after they met on the Titanic, but for a long time, he was unable to express his emotions to her. Futurama cartoon cursor with Kif Kroker.