The Mechthorian was a model of security droids manufactured by the Stonewall Labs company during the Imperial Period. This droid was Ithorian-shaped and was taller than a medium-sized Human. The Mechthorian was able to fight using ranged weapons.
Mechthorians were manufactured by Stonewall Labs prior to the Battle of Yavin. When the Stonewall Labs facility on Naboo was closed, security droids remained activated. Several ZH-28 guards, SWL-5 overseers, LC-92 antagonists, Mechthorians and B1 battle droids continued their patrol programs in the laboratory and in the surrounding area. Circa 1 ABY, a spacer was trying to acquire an experimental Old Republic droid module from a droideka in the Stonewall Labs facility. The spacer entered the laboratory and fought several Mechthorians to finally access the module.