THE MIDDLE - "Worry Duty" - Frankie is worried that Axl's going to get his heart crushed again when his on-again/off-again girlfriend, Morgan (Alexa Vega, "Spy Kids," "Ruby & the Rockits"), re-enters his life and tries to mold him into the man she wants him to be. Meanwhile Brick learns what it means to be a mother hen when he has to watch over a baby chick for a school science project, on "The Middle," WEDNESDAY, APRIL 28 (8:30-9:00 p.m., ET) on the ABC Television Network. (ABC/JORDIN ALTHAUS) ATTICUS SHAFFER