Watch Eureka Season HD Full Free on solarmovie.do. Watch Eureka tv series online free. A U.S. Marshal becomes the sheriff of Eureka, a remote, cozy little Northwestern town where the best...A U.S. Marshal becomes the sheriff of Eureka, a remote, cozy little Northwestern town where the best minds in the US have secretly been tucked away to build futuristic inventions for the government which often go disastrously wrong.