LOS ANGELES, May 8 — For years, Hollywood has talked about the supposed convergence of films and video games. And for years, the primary results have been low-budget movies based on games, and uninspired games based on films.

On Tuesday, Blizzard Entertainment, a leading game developer, hopes to reverse that trend as it plans to announces a deal with Legendary Pictures, a major Warner Brothers affiliate, to make a big-budget "Lord of the Rings"-style live-action film based on Blizzard's wildly popular Warcraft series.