In tonight's finale, Michael and Lincoln fight to protect Sara and Mike; Michael and the rest of the gang face Poseidon in the ultimate showdown.
Elsewhere on TV ...
• "Downward Dog" (7 p.m., ABC/Ch. 4): Nan brings Martin to work with her, and he's not happy with what he learns.
• "America's Got Talent" (7 p.m., NBC/Ch. 5): Season 12 begins.
• "Victorian Slum House" (7 p.m., PBS/Ch. 7): Social changes of the 1900s; measures are taken to alleviate the plight of the poor.
• "Genius" (7 and 10 p.m., National Geographic Channel): With the outbreak of World War I, Einstein's personal life reaches a breaking point.
• "If Loving You is Wrong" (7 p.m., OWN): Kelly discovers a new way to protect herself from Travis.
• "Animal Kingdom" (7 and 8 p.m., TNT): In the Season 2 premiere, a risky heist misfires and the boys blame Smurf.
• "American Epic" (8 p.m., PBS/Ch. 7): America's diverse cultures contribute to its musical styles; Mississippi John Hurt's blues inspires musicians. (Finale)
• "iZombie" (8 p.m., CW/Ch. 30): A dungeon master is killed; Blaine's experiment goes awry; Ravi stumbles across some deadly information.
• "Imaginary Mary" (8:30 p.m., ABC/Ch. 4): Alice sleeps over at Ben's when his kids are in the house.
• "48 Hours: NCIS" (9 p.m., CBS/Ch. 2): Naval Criminal Investigative Service agents NCIS agents reveal their investigations into taking down terrorists, hackers and spies
• "World of Dance" (9 p.m., NBC/Ch. 5): Elite dance acts from all ages and dance genres compete in this new show. Jenna Dewan Tatum hosts; Jennifer Lopez, Derek Hough and NE-YO are the judges.
• "Pretty Little Liars" (9 p.m., ABC Family): The Liars close ranks tas Detective Furey closes in on uncovering what happened to Archer Dunhill.