The Indigo Mob is a group of Los Angeles-based mobsters often at odds with known gangster Jackson Farrell. Their names are Hank and Lucky with Hank being the voice of the group and Lucky his partner. After hearing about Farrell's robbery at the Monarch Bank, they tail him to the South Pacific and encounter the castaways of the S.S. Minnow, who Farrell has disguised as natives. Hank confuses Mr. Howell as the village bum and hits on Ginger, getting slapped as a result. Despite Gilligan and the Skipper trying to let them know about Farrell, the Indigo Mob leaves the island without Farrell and no link to the stolen money.
- The Indigo Mob was played by Louis Quinn as Hank and Jack Sheldon as Lucky with voice actor Herb Vigran supplying Lucky's voice.