Yes, it’s a difficult concept to fathom for us gamers, but film star Sigourney Weaver has loaned her voice to a video game this year that’s not “Ghostbusters.”

Instead, she’ll do voiceovers for James Cameron’s “Avatar,” a sci-fi title being adapted by Ubisoft from the 3-D film of the same name. In “Avatar,” Weaver plays Grace Augustine, a botanist dealing with love and loss on a remote world populated by 10-foot blue humanoids. (Not quite like dealing with a Gozer in uptown Manhattan, but intimidating nonetheless.)

Weaver and Cameron also worked together on the 1986 movie “Aliens.”

The movie has been in post-production about a year. “Avatar” the game is expected to debut with the movie in time for the Christmas shopping season and appear in versions for on all the major consoles plus PlayStation Portable, Nintendo DSi and PC.

Though “Avatar” is a big deal, and Game Guy wishes Weaver and Cameron luck on the game portion of the project, as games derived from movies have not been great lately, he really hoped to hear Weaver reprise her role as Dana Barrett in the “Ghostbusters” game released last month; she and Rick “Keymaster” Moranis are the only original characters from the 1984 movie not also in the game.

And Game Guy believes “Ghostbusters” is diminished a little bit as a result.