Who knows how to best celebrate Labor Day? America's favorite cartoon family, of course. Workplace wrangling dominates the days of Springfield in Monday's holiday block of "The Simpsons" (6 p.m.-2 a.m., FXX) that starts with "The Simpsons Movie" at 4 p.m. Also on point is Mike Judge's animated "King of the Hill" (9 a.m.-11:30 p.m., Comedy Central), following dad Hank Hill's Texas propane gig from the show's 1997 pilot episode. There's even an animated adios in 6 p.m.'s hourlong series finale of "Adventure Time" (marathon 6:15 a.m.-8 p.m., Cartoon).
Other Monday marathons:
J.K. Simmons plays a spy wonk just doing his job when he discovers an alternate world (and alternate version of himself) in this year's compelling first season of "Counterpart" (Monday 10 a.m.-7:30 p.m., Starz).
Also: "Little House on the Prairie" marathon continues (through Tuesday 8:30 a.m., Hallmark Drama); "Walker, Texas Ranger" marathon continues (through Tuesday 6 a.m., getTV); "Murder, She Wrote" (6 a.m.-6 a.m., Hallmark Movies); "House" (9 a.m.-6:30 p.m., Pop); "Shameless" (9 a.m.-9 p.m., Showtime); "CSI: Miami" (10 a.m.-6 p.m., WE). There's even season 5 in Spanish of "The Walking Dead" (1-10 p.m., Universo).
There's always more medical care to be delivered on "M*A*S*H." Sundance TV's weekend run continues through Tuesday 6 a.m., with Robert Altman's earlier film version coming Tuesday at 9 a.m. TV Land also has a Monday marathon (1:45-8:15 p.m.).
Also: Linda Lavin's "Alice" (5 a.m.-11:30 p.m., Antenna) works her grits off for Labor Day; Rachel and Ross are the focus on "Friends" (8 a.m.-5 p.m., TBS); "Home Improvement" (3-7 p.m., UP); plus youth shows "Nicky, Ricky, Dicky & Dawn" (6 a.m.-2 p.m., TeenNick) and "Sam & Cat" (2-10 p.m., TeenNick).
Product entrepreneurs compete for financing in "Shark Tank" (Monday 4-10 p.m., CNBC).
Also: Cops are on the job in "Live PD" (7 a.m.-8 p.m., A&E); season 3 of "Project Runway" (6 a.m.-7 p.m., Bravo); "American Pickers" (8 a.m.-4 a.m., History); "Ghost Adventures" (8 a.m.-4 a.m., Travel).
Settle in for festivals of adult and family favorites, including the final six outings of "Harry Potter" (6:30 a.m.-1:35 a.m., Syfy); three tales of "Home Alone" (9:22 a.m.-2:52 p.m., again 6:16-11:46 p.m., Starz Kids); three '80s entries from "Indiana Jones" (10 a.m.-10 p.m., Paramount); four films of "The Hunger Games" (noon-11 p.m., TNT); the first two parts of "The Godfather" (12:30-9 p.m., AMC). Plus, Encore Action continues its James Bond week with Monday's Roger Moore titles, including "For Your Eyes Only" (8 a.m., 4:30 p.m., 1:10 a.m.).