Sean quickly assembles a new crew, including the good-hearted Moose (series veteran Adam Sevani), who brings the group together; the stubborn Andie (the Demi Moore-esque Briana Evigan from “Step Up 2: The Streets”); and the daffy Jenny Kido (Mari Koda, another series regular), who provides broad comic relief. There are so many characters crammed in here, though, that it’s easy to forget that some of them even exist. Which is the guy from Baltimore and which is the one from the Bronx? Doesn’t matter, really, as long as they hit their marks sharply