4-LOM «FOR-ELLOEM» was an ambitious LOM-series protocol droid who overrode his programming and became a galactic thief and later a bounty hunter. He often worked together with Gand findsman Zuckuss. Following the Battle of Hoth, both 4-LOM and Zuckuss were hired by the Sith Lord known as Darth Vader to capture Han Solo, captain of the Millennium Falcon and hero of the Alliance to Restore the Republic. However, the bounty on the smuggler‘s head was instead claimed by the infamous Boba Fett.

A cold, calculating and ambitious mechanical, 4-LOM suffered from logic glitches and personality software corruption that allowed him to escape his original programming.

A LOM-series protocol droid, 4-LOM stood 1.67 meters tall and was covered in battered rusted black droid plating. His head was designed to emulate the insectoid species he was designed to serve, with two large green compound photoreceptors.

4-LOM first appeared in the 1980 film Star Wars: Episode V The Empire Strikes Back, where he was portrayed by Chris Parsons, who was also a stand-in for Anthony Daniels and played K-3PO and E-3PO in the same movie. His costume was made from a variety of different parts of protocol droid costumes originally designed for C-3PO that the set designers of The Empire Strikes Back cobbled together.

In 1982, Kenner released action figures of 4-LOM and Zuckuss, but transposed their names.