Sunday best bets

Mike Rowe

7 p.m. on AETN ^

Miss Scarlet and the Duke on Masterpiece

Detective Fitzroy (Evan Mccabe) hires Eliza (Kate Phillips) to look into a case of police corruption after he sees a colleague plant evidence on a suspect in the new episode “Bloodline.” But just what will they be able to do when they uncover the truth? Stuart Martin, Ansu Kabia, Cathy Belton, and Simon Ludders also star.

7 p.m. on KATV _ Movie: The Avengers

A dream team of Marvel Comics superheroes comes together in this big, loud and immensely fun 2012 action epic, with a number of the stars reprising their roles from earlier films: Robert Downey Jr. (“Iron Man”), Chris Hemsworth (“Thor”) and Chris Evans (“Captain America: The First Avenger”). Scarlett Johansson and Samuel L. Jackson also are back as Black Widow and Nick Fury, and Mark Ruffalo and Jeremy Renner join in as the Hulk and Hawkeye.

7 p.m. on DISC Dirty Jobs

Mike Rowe descends into the depths of an aging manhole, coating it with a polyurea liner to extend its warranty in Murfreesboro, Tenn., because few things go bad like an aging manhole. Then, Mike walks into a bar with an horologist and a priest to set the time right as he restores a historic clock tower in the new episode “Manhole Rehab; Clock Caretaker.”

8 p.m. on SHOW Your Honor

Michael (Bryan Cranston) resists a “favor” from Fia (Lilli Kay), but Olivia (Rosie Perez) pushes him to exploit a newfound connection. Meanwhile, Little Mo’s (Keith Machekanyanga) deal goes sour, leaving Eugene (Benjamin Flores Jr.) to pick up the pieces. Then a face-off between Michael and Jimmy (Michael Stuhlbarg) results in a startling confession in the new episode “Part Thirteen.”