“Double Dare” profiles the two stuntwomen who doubled for Wonder Woman and Xena. Jeannie Epper, who stood in for Lynda Carter in the '70s, is a respected veteran in her 60s. New Zealander Zoe Bell got her “Xena” break while still a teenager. Now Bell's in Hollywood (and lands an audition for “Kill Bill”) and Epper is mentoring her. But that doesn't mean she's giving up on stuntwork herself. Following the film: the animated short “Piki and Poko: Taking the Dare.”