Episode Title:Membership Drive.Episode Description:The Justice Force is expanding its ranks and Mike plans on joining up as the Turtle Titan while Leo is more concerned in alerting them to the threat of the original Shredder. But when Nano reappears (thanks to Bishop and Baxter Stockman), everything quickly spirals out of control into a superhero vs. nanotech slugfest! Has Nano come back as friend or foe? And will the Turtle Titan and Leo survive long enough to find out?