NCIS: LOS ANGELES hits the ground shooting as the team lands in Romania to rescue their boss and friend, Hetty Lange, from the ruthless crime family. But Hetty's mission is as much personal as it is professional, revealing a bombshell secret about team leader 'G' Callen's past. This secret culminates in the team's fist-ever collaboration with Hawaii Five-O, in a joint effort to prevent a global pandemic, which ultimately brings Callen's vendetta full circle.