"Lab Rats" Cast Teases Season 4 Details On Set

YH pays yet another visit to the set of Disney XD's "Lab Rats: Bionic Island", but this time, we hand over hosting duties to 10-year-old Brendan Bernstein! He sits down with stars Tyrel Jackson Williams, Billy Unger, Kelli Berglund, and Spencer Boldman to find out how much of their own stunts they get to perform, their fierce hair secrets, and who the biggest prankster on set is, plus we get some teasers for Season 4!