NEW YORK (AP) — ABC moved quickly to land one of the three men who foiled a terror attack on a Paris-bound train last month for the 21st season cast of "Dancing With the Stars." The cast is rounded out by "Spy Kids" actress Alexa PenaVega and her actor-husband, Carlos; singer Andy Grammer; singer Chaka Khan; 15-year-old online star Hayes Grier; "Real Housewives of Atlanta" cast member Kim Zolciak Biermann; former Backstreet Boy Nick Carter; reality star Tamar Braxton; and Triple Crown-winning jockey Victor Espinoza.