Friday television

“Defiance”8 p.m. Syfy — A gruesome murder is committed by an unusual beast that’s on the loose and being hunted down by Nolan and Irisa. “Cold Justice: Sex Crimes” 9 p.m. TNT (new series) — Investigators Casey Garrett and Alicia O’Neill attempt to track down the person who brutally attacked a retired music teacher. “Love Thy Neighbor”9 p.m. OWN (second season summer finale) — Danny and Troy marry in Vegas. “Strike Back” 10 p.m. Cinemax (fourth season debut) — In Bangkok, a gang led by a ruthless expatriate kidnaps the British ambassador’s daughter.