The Factory Theater’s spoof of Elvis Presley movies (in particular G.I. Blues) stars Scott Oken as Chet, a rockin’ recruit stationed in 1961 Germany who’s assigned to chaperone a visiting general’s daughter. Writers Oken and Ernie Deak nail the films’ inane plots and leering humor, while Oken’s score would sound at home in a real Presley pic. Oken’s comical Elvis impersonation is enhanced by his incongruous Jackie Gleason-like girth, and director Nick Digilio has coached high-energy performances from the 15 actors, especially Manny Tamayo (in a Don Rickles mode) and Tucker Curtis as Chet’s buddies and Jennifer Santanello as a hyperhormonal teen. The one-act runs out of steam before its 90 minutes are up, but it’s still diverting summer fluff. Through 7/15: Fri-Sat 8 PM, Sun 7 PM, Prop Thtr, 3502-4 N. Elston, 866-811-4111, $20.