High Moon Studios began life as a San Diego branch of Sammy Studios. This venture was meant to bring Sammy into the video games industry, though before the studio could produce a game, it broke away from Sega Sammy during the 2004 Sega and Sammy merger. The San Diego studio renamed themselves High Moon Studios and were quickly acquired by Vivendi Games, which became part of Sierra Entertainment.
High Moon Studios released their first game later that year, Darkwatch. However, since development had began prior to High Moon being acquired by Vivendi, the game was published by Capcom in the United States and Ubisoft in the United Kingdom. High Moon's first game developed for Sierra was released in 2008, The Bourne Conspiracy. This was High Moon's first of many planned games based on the Jason Bourne licence, however the license was lost during Activision's acquisition process of Vivendi's assets.
High Moon's third game, Transformers: War for Cybertron, was released by Activision on June 22, 2010. High Moon's fourth outing, Transformers: Dark of the Moon, was released on June 14, 2011, and their fifth game, Transformers: Fall of Cybertron, a sequel to War for Cybertron, is due for release on August 21, 2012.
On July 14th, 2012, it was announced during the San Diego Comic-Con that High Moon was developing a game based on the Marvel character Deadpool, due for release in 2013.