NCIS Abby (Pauley Perrette) is found in possession of a bomb after her Homeland Security think tank is compromised in the opener of a two-episode crossover with spinoff series “NCIS: New Orleans.” Mark Harmon, David McCallum, Jennifer Esposito and Wilmer Valderrama star. 8 and 10 p.m. CBS
Tough Mudder: The Challenge Within The online series — available at CW Seed — following several competitors in the Tough Mudder endurance race broadcasts its season finale. 8 p.m. KTLA
The Middle After pipes burst in the basement and the house starts flooding, Frankie and Mike...