This has to be one of the most interesting movies I have heard about in a long time.
A Ninja Clan has been framed for assassinating the Grandmaster. Not only that but they are trapped a thousand feet below the Earth's crust. The lost Ninja Clan must battle their way up an underground nuclear bunker filled with hordes of mutants, zombies and supernatural enemies if they want to survive. Basically the story is a ninja vs zombies remake of 1979's The Warriors.
Ninja Apocalypse will be coming to DVD and Blu-Ray on August 5th, but you can catch it on the opening night of the San Diego Comic Con (Marina Ballroom D in the Marriott Marquis and Marina directly adjoining the convention center, in case you were wondering).