Ever since their daughter was born, it was only a matter of time before Brennan (Emily Deschanel) and Booth (David Boreanaz) finally tied the knot. And while they do say "I do" in Season 9 in a TV wedding for the ages, it's not before an unforgettable proposal that involves the diabolical Christopher Pelant (Andrew Leeds), whose obsession with Brennan brings them closer than they've ever been. Of course, the couple's honeymoon in Buenos Aires turns into a busman's holiday when they help a detective investigate the murder of a Nazi war criminal. Back at the Jeffersonian, Angela (Michaela Conlin) and Hodgins (T.J. Thyne) discuss having another child; Sweets (John Francis Daley) takes a leave of absence; Cam (Tamara Taylor) is the victim of identity theft; Clark (Eugene Byrd) writes a novel; and Wendell (Michael Grant Terry) is jolted by news that could affect his future at the lab.

In the drama series' second season, the men and women of Firehouse 51 face an uncertain future after learning that their station may be slated for a shutdown. Meanwhile, Lt. Severide (Taylor Kinney) is targeted by a serial arsonist; Lt. Casey (Jesse Spencer) becomes a temporary guardian to Andy's two young children after their mother is in a drunken-driving accident and arrested for manslaughter; and Mouch (Christian Stolte) runs for union president. In non-firehouse-related events, a shady individual threatens Molly's bar, and Herrmann (David Eisenberg), Dawson (Monica Raymund) and Otis (Yuri Sardarov) fight to keep it in business. The season includes a crossover episode with "Chicago PD."