He hits the big screen next week in "Without a Paddle," has just finished a comedy with Luke Wilson and has now signed on to co-star with Tim Robbins in a big-budget adventure tale.
The latest project, called "Zathura," is based on a children's book by Chris Van Allsburg, who also wrote the story that spawned "Jumanji." Like the 1995 Robin Williams movie, "Zathura" is about a board game that sends two kids into another world, only this time it's outer space instead of the jungle.
Dax will play an astronaut who has been trapped inside the game, while Robbins plays the kids' father. "Swingers" star and "Elf" director Jon Favreau will direct when production starts later this summer in Los Angeles.
"It's gonna be a blast," Shepard said. "They built these huge sets that rock back and forth and then these tanks ... and the whole thing will go 40-degree [angles to either side] so it will be really fun to make."
Dax heads into "Zathura" coming off a comedy directed by "Beavis and Butt-head" creator Mike Judge.
"Basically, Luke Wilson gets frozen in time for 1,000 years," Dax explained of the untitled flick, at one time called "3001." "He wakes up and everyone has become stupid because all the idiots reproduced. And I'm probably the stupidest of all the stupid people and I'm Luke Wilson's lawyer and best friend. It's hilarious."