Special Agent Gribbles worked for the Galactic Federation, heading the investigations of Rick Sanchez. Rick called him, posing as Jerry Smith, to tell the federation where he would be, as well as to get his family sent back to Earth. Gribbles is told that Rick is headed for the Plim Plom Tavern, which is where the Galactic federation apprehends him later on. Agent Gribbles is never seen, his voice is heard over the phone.