It's the weekend -- don't forget about U.S. Open tennis!
Here's what we'll be watching ...
FRIDAY, SEPTEMBER 11
8:30 p.m., CARTOON
Ben 10: Alien Force Season 3 premiereThe third season kicks off with a battle between Ben and Vilgax to determine who will rule Earth.
10 p.m., USAJames Roday) to think that Lassiter (Timothy Omundson) is in danger.
SATURDAY, SEPTEMBER 12
5 p.m., NGC
6 p.m., BBC America
Robin Hood Season 3 premiereRobin Hood (Jonas Armstrong) is back for a third season, and he's all amped up to separate from his gang and avenge Marian's (Lucy Griffiths) death.
11:35 p.m., NBC
Saturday Night Live rerunWho cares if it's a rerun? Justin Timberlake was hilarious when he hosted in May, and characters like Cornelius Timberlake and the Target Lady are too good to watch just once.
SUNDAY, SEPTEMBER 13
8:15 a.m. to 8 p.m., TNT
Lord of the Rings trilogy marathonGet your Frodo on for nearly 12 straight hours -- The Fellowship of the Ring, The Two Towers, and The Return of the King are on back-to-back-to-back.
8 p.m., FOX
King of the Hill Series finaleThe end is here! Bobby is the focus of the two-episode series finale -- and he's caught the attention of a few ladies and the Heimlich County Junior College meat-grading team. At least he's going out on top.
9 p.m., HBO
True Blood Season 2 finaleSeason 2 in Bon Temps comes to a close as the craziness reaches a peak: Sookie's (Anna Paquin) involved in Maryann's (Michelle Forbes) sacrifice ceremony, Sophie-Anne (Evan Rachel Wood) is wary of Bill's (Stephen Moyer) curiosity, and Sam (Sam Trammell) puts his life on the line.
9 p.m., MTV & VH1
10 p.m., HBO
Hung Season 1 finaleHung hung on for one season! In the Season 1 finale, Tanya (Jane Adams) and Lenore duke it out for control over Ray (Thomas Jane).
U.S. Open men's final, 1 p.m., CBS
Big Brother, 8 p.m., CBS
Shark Tank, 9 p.m., ABC
There Goes the Neighborhood, 9 p.m., CBS
Defying Gravity, 10 p.m., ABC
Mad Men, 10 p.m., AMC
Kourtney and Khloe Take Miami, 10 p.m., E!
HGTV Design Star, 10 p.m., HGTV
Entourage, 10:30 p.m., HBO
What are you watching tonight?