SEXY starlet Jenna Elfman has gotten so deeply into Scientology that her main goal these days is to help it take over the world. Scientology "is a complete understanding of what is happening on the planet right now," Elfman, best known for her role on "Dharma & Greg," told Scientology magazine Celebrity. She boasts that she's on the second-to-last "Operating Thetan" or "OT" level in the organization's hierarchy. Elfman says you must devote yourself to Scientology or "you could be dead." Fellow celeb Scientologists include Tom Cruise, John Travolta and Lisa Marie Presley. Scientologists who reach "OT 3" are told...