"Ruby and the Rockits" (7:30 p.m., ABC Family): The show rates only two stars, but the premiere is still worth watching for two reasons: 1. Brothers David and Patrick Cassidy co-star, and brother Shaun writes for it. (You missed your chance to watch David's hot daughter Katie -- she starred in "Harper's Island" -- but maybe she'll cameo.) 2. David and Patrick play former '80s pop stars, so there will be parachute pants jokes.
"Medium" (9 p.m., WBBM-Channel 2): Patricia Arquette settles in for her first night on CBS.
"The Colony" (9:01 p.m., Discovery): Ten volunteers will navigate an experimental post-apocalyptic world. Why does this sound like the Stephen Baldwin/Pauly Shore vehicle "Bio-Dome"?
"Rescue Me" (9 p.m., FX): Tommy is finally confronted about his alcoholism. No very special cross-over episode with Dr. Drew Pinsky?