Peter, Olivia, Walter, Astrid and Broyles face off against the Observers in one final and extraordinary battle for the fate of mankind.

Harvey and Mike take on a criminal suit that hits close to home for Mike, who struggles to separate his personal feelings from the facts of the case.

Changes continue to rock the White House, as we also flashback to learn more about the rigged election. Meanwhile, things get heated between Olivia and Edison after he makes a shocking accusation.

Gloria and Jay try to make Manny’s 14th birthday extra special by planning a surprise party; Haley starts hanging out with a much older guy.

Oliver’s confidence is shaken after being beaten by the Dark Archer and he takes a break from being Arrow. However, when Laurel calls Arrow for help investigating a firefighter’s suspicious death, he reluctantly agrees but his hesitance while fighting almost costs him his life. Meanwhile, Tommy throws a benefit for the firefighters and Thea tries to lift Moira out of her depressive state.

When Frankie and Mike dedicate a day to each of their children, Axl takes them to a paintball range, Sue has them do 17 separate activities and Brick wants to go to a sci-fi convention.

When an up and coming DJ is killed at a pop star’s album release party, Beckett and Castle must dive into the raucous world of New York’s music industry. Then, when the investigation leads to a troubled teenager, Esposito takes the kid under his wing, hoping to put him on the right track before it’s too late.

When Robin learns that Barney never asked her father’s permission before proposing, she insists that he seek his approval before announcing their engagement. Meanwhile, Ted keeps his feelings concealed by throwing himself into planning their wedding.

Will, Diane and Alicia help Elsbeth Tascioni when she is arrested. Eli and Jordan give Peter conflicting pieces of advice.

In the Season 2 premiere, the aftermath of the sexual-harassment scandal leaves Marty and his Pod adjusting to a new corporate culture at Galweather Stearn, where the interim CEO entrusts consummate closer Marty with sealing a big deal. Later, a boozy night on the town leaves Jeannie reeling, while Marty’s relationship with Roscoe is in need of some repair.