Little green men

Little green men are creature that were controlling Lefty robot.

History
During the episode Lefty of Dipper's Guide to the Unexplained, they are controlling a robot so no one would find out about them. During the third test when Dipper tries to see Lefty Robot's right side, Dipper finds out about the little green men controlling the robot. Upon discovery, they consume small, red, glowing cubes which were part of a pact. One said that he couldn't fulfill the pact because he "had a family", to which his friend replied, "You took the oath!" They commit suicide by swallowing the the red cubes, fall out of the robot, and then disappear after they die. Then robot self destructs.

Appearance
They are small, gelatinous green creatures wearing gloves and a belt with a lightning bolt on the buckle. They have relatively large eyes and prominent lips.

Trivia

 * There are a total of 16 creatures shown.