The EVO Troopers (short for "environmental") were among the Empire's most specialized stormtroopers. There was also a Shadow trooper variant call the Shadow Trooper
Equipped with heavy enhanced armor with breathing tubes and undergoing special training, EVO troopers were able to survive and operate in the most hazardous of conditions such as extreme heat, acid rivers, and lightning. They were equipped with FA-3 flechette launchers, although some utilized T-21 light repeating blasters and E-11 blaster rifles.
EVO troopers could be encountered wherever extreme environmental battlefield conditions existed and several were posted on the science ship ISS Empirical, Kashyyyk, Felucia, Raxus Prime, and even the unfinished Death Star. The bulk of EVO troopers were selected from groups of stormtroopers who expressed hatred towards non-humans, making them more aggressive toward the alien populace they encountered on harsh worlds. They were eventually succeeded by Hazard troopers. On the second mission of Darth Vader's apprentice Starkiller to Raxus Prime, several EVO troopers again were stationed on the planet.
- Star Wars: The Force Unleashed comic (Appears in flashback(s))
- Star Wars: The Force Unleashed video game