What to Watch Friday: Merlin Conjures Its Final Season, Welcome Back to Portlandia and More

Merlin Cancelled, Will End After Season 5On TV this Friday: Merlin begins its magical final season, CSI: NY kills two vics with one weapon, Blue Bloods look for a green murderer and Portlandia gets back to quirk. Here are 10 programs to keep on your radar.

7 pm – 1 am (Saturday) Californication marathon (Showtime) | Relive Hank’s Season 5 return to Los Angeles – in all of its tawdry glory. (Check out what’s in store for Season 6, which gets underway Jan. 13.)

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8 pm Undercover Boss (CBS) | The CEO of Mood Media goes undercover at his company that helps stores “communicate with consumers” via sounds, sights and… smells.

8 pm Last Man Standing (ABC) | When Eve is suspended from school for calling someone a bad name, Mike’s surprised to learn that constitutes bullying.

8:30 pm Malibu Country (ABC) | Reba tries to rally the school moms to help her revive the music program.

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9 pm CSI: NY (CBS) | The CSIs are puzzled when two different victims are linked by the same unusual weapon. Jeff Branson (All My Children) guest-stars. (Pssst, longtime viewers will not want to miss this one.)

9 pm Great Performances (PBS) | Paul Simon’s Graceland Journey: Under African Skies follows the prolific musician as he returns to South Africa more than 25 years after the seminal album’s release.

9 pm Shark Tank (ABC) | Among tonight’s hopeful entrepreneurs: two buddies who combine their favorite pastimes – beer and arcade games – into one cabinet.

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10 pm Blue Bloods (CBS) | Danny and Kate try to track down a radical, environmentally minded serial killer.

10 pm Merlin (Syfy) | Season 5 premiere: The final season opens with Queen Guinevere and the Knights of the Round Table by Arthur’s side… and Camelot’s destruction already in the works. (But will the mythical world live on past the final episode?)

10 pm Portlandia (IFC) | Season 3 premiere: Back-to-back episodes find Spyke and Iris joining a gang of former MTV stars to take the music channel back from tweens, and the mayor sends Fred and Carrie on a door-to-door mission to Seattle to recruit new Portland citizens.

Hit the comments with your must-see picks from tonight’s lineup!