Infogrames/Atari sub-licensed the North American video game rights to the franchise via FUNimation, who (other than Viz with the manga) is the primary license holder here. Back in October 2007, we learned that FUNimation was claiming Atari was in breach of their contract together, and that they wanted the sub-license terminated. It turned out that FUNimation believed Atari was not living up to their end of the bargain in terms of advertising the Dragon Ball video games. It was settled after another $3.5 million payment to FUNimation. Atari's agreement with FUNimation was to take them through January 2010, at which point the North American branch of Namco-Bandai decided to just take matters into their own hands and distribute their own company's games (in conjunction with FUNimation, of course).
Nowhere in there does anything about any of the game developers (Dimps and/or Spike) get mentioned. They are irrelevant to all of that. The move was made from Dimps to Spike for a new series of games, most likely because Dimps moved on to co-develop Street Fighter IV around that time.








