“Avatar” trailer tickets will be available free online for a limited 16-minute sneak peek trailer to play in Imax theaters on August 21.

Beginning Monday, August 17, free tickets will be distributed online for the trailer for James Cameron’s 3-D sci-fi film.

James Cameron will present the extended trailer, being shown in 101 Imax theaters in the U.S. and Canada, on August 21.

If you’re not lucky enough to catch the Imax trailer, theaters worldwide will show the regular Avatar movie trailers on the same date.

Check out the AvatarMovie.com web site for more information about the trailer tickets.

Avatar opens in theaters worldwide December 18.