MTV will present a live webcast of a roundtable with director James Cameron and other featured talent from the film “Avatar” on Dec. 3 as a prelude to a half-hour television special the network will air later in the month.

Thesps Zoe Saldana and Sam Worthington will join producer Jon Landau and Cameron on the webcast, to be moderated by MTV News managing editor Josh Horowitz. The 30-minute event, which will feature unseen footage from the movie, also will be shown on the “Avatar” Facebook fan page, with fans able to submit questions at either site.

The TV special, part of MTV’s “Behind the Screen” series, will air Dec. 16, two days before the film’s scheduled release date.

MTV Networks exec veep of integrated marketing John Shea said discussions on the special with “Avatar” studio Fox began more than six months ago, saying the event reps the net’s first standalone streaming webcast.