The Flash Caitlin (Danielle Panabaker) is abducted by Anumet (returning guest star Katee Sackhoff) and is forced to perform a tricky medical procedure. The Flash (Grant Gustin) also becomes a prisoner in this new episode. 8 p.m. KTLA
The Middle In its final season, the family comedy marks its 200th episode. Patricia Heaton, Neil Flynn, Atticus Shaffer, Eden Sher and Charlie McDermott star. 8 p.m. ABC
Lethal Weapon Riggs and Murtaugh (Clayne Crawford, Damon Wayans Sr.) try to separate fiction from fact when an investigation draws them into a world of conspiracy theories. Kristen Gutoskie, Keesha Sharp, Kevin Rahm...