Activision acquired the studio in 2001 for about . Following the success of Call of Duty from Infinity Ward, Activision moved Treyarch to assist in the series' development, trading off each year' major release between the two studios. Gray Matter Studios: While Gray Matter was originally founded in 1993 as Xatrix Entertainment, it was rebranded to Gray Matter in 1999 as they began work on Return to Castle Wolfenstein, in conjunction with Nerve Software and oversight by id Software who owned the Castle Wolfenstein IP. Activision, the game's publisher, acquired a portion of Gray Matter's stock during this time. Return to Castle Wolfenstein was a critical and financial success, and led Activision to acquire the remaining shares of Gray Matter in 2002 for about , with the intent to help Infinity Ward expand out the Call of Duty franchise. In 2005, Activision made the decision to merge the smaller Gray Matter into the larger Treyarch to put their combined talents towards Call of Duty 3. RedOctane: Around 2005, Red Octane was co-developing Guitar Hero, a console game based on the arcade game GuitarFreaks, with Harmonix; Harmonix was developing the software while RedOctane developed the instrument controllers. Guitar Hero was a major success. Activision purchased RedOctane for nearly in June 2006. The series has since earned more than in revenues. Toys for Bob: Toys for Bob was founded by Paul Reiche III, Fred Ford, and Terry Falls in 1989 and gained success in developing the first two Star Control games, and later made film-to-video game adaptions. Activision purchased the studio in 2005, and had given them work on some of the Tony Hawk's games as well as other licensed properties. Following Activision's merger with Vivendi, Activision gained the Spyro intellectual property and assigned Toys for Bob to develop the series in a new direction, leading to the toys-to-life Skylanders series. Merger with Vivendi Games (2008) While Activision was highly successful with its range of developers and successful series, Kotick was concerned that they did not have a title for the growing massively multiplayer online market, which presented the opportunity for continued revenues from subscription models and microtransactions instead of the revenue from a single sale. Around 2006, Kotick contacted Jean-Bernard Lévy, the new CEO of Vivendi, a French media conglomerate. Vivendi had a games division, Vivendi Games, that was struggling to be viable at the time, but its principal feature was