Galactron is a robot in Nuka-World.
John-Caleb Bradberton ordered a series of heavily customized Protectrons for use at his theme park. They can be broadly separated into two types: Nukatrons and Galactrons. Galactrons were standard security Protectrons with a custom white and gold paintjob and enhanced laser weapons, ostensibly intended for use in the RobCo Battlezone gauntlet. Both variants were a way to conceal military hardware in broad daylight, so that Bradberton could use the Nuka-World theme park to rebuild civilization. Unfortunately, he got ahead of himself in his plans and they never saw fruition.
Galactrons are simply repainted Protectrons that offer a minor challenge. However, they can soak up damage better on higher levels, as they have two more variants that spawn when the player is at high levels.
Galactron appears in Nuka-World.