(Mon 5/19-Sun 5/25) Season finale of "Reaper," plus new "Battlestar" and "Doctor Who."
Reaper: "Cancun" (Season Finale). (Episode 1x18). The demons fear that Sam threatens their rebellion, so they set a trap for him. Meanwhile, Sock finds himself falling for a female demon (Cindy Sampson). Tue 5/20, 9:00 PM, The CW.
Smallvile: "Bizarro" (R). (Episode 7x01). As the seventh season begins, Clark faces his most deadly enemy---his Bizarro doppelganger---after Lex's secret lab at Reeves dam is destroyed; Lex is saved from drowning by a mysterious female savior, but his past catches up with him. Thu 5/22, 8:00 PM, The CW.
Supernatural: "The Magnificent Seven" (R). (Episode 3x01). Sam and Dean team up with Bobby (Jim Beaver), but they have their hands full as they battle seven deadly demons who use the dark side of human nature to their advantage. Thu 5/22, 9:00 PM, The CW.
Moonlight: "B.C." (R). (Episode 1x06). Mick searches for a powerful vampire from Josef's past who is linked to a drug-overdose case that Beth is investigating. Fri 5/23, 9:00 PM, CBS.
Doctor Who: "The Poison Sky" (New). (Episode 4x05). The conclusion of the Doctors battle with the Sontarans, with the help of Martha Jones, Donna Noble, and UNIT. Fri 5/23, 9:00 PM, Sci Fi.
Battlestar Galactica: "Home Part 1" (New). (Episode 4x08). Starbuck and Helo reunite with Roslin, who considers executing pregnant Cylon Sharon, while Apollo tangles with Zarek and his sinister sidekick (James Remar). Aboard Galactica, a brooding Adama revamps his officer corps by replacing his wayward son with Catman Birch (Ben Ayres). Fri 5/23, 10:00 PM, Sci Fi.