Christina Hood of the L.A. Derby Dolls, an all-female roller derby league, scrimmages against Beach Cities in Los Angeles on Jan. 4. Christina Hood of the L.A. Derby Dolls, an all-female roller derby league, scrimmages against Beach Cities in Los Angeles on Jan. 4. “Be your own hero,” read the tagline for 2009’s “Whip It,” the first Hollywood movie to feature the female-powered sport of modern roller derby. Directed by Drew Barrymore, the film featured Ellen Page as a small-town Texas teen who reinvents herself as a banked track speedster dubbed “Babe Ruthless.”