Abby visits NCIS: Los Angeles on the episode "Random on Purpose." She's tracking a serial killer.

Cheers to Los Angeles! Abby has a drink during her crossover episode, titled "Random on Purpose.'

Welcome to Los Angeles, Abby. During this crossover scene, the character sits with Eric Beal.

We weren't sure what to think of Chris O'Donnell as Callen. But he's perfect for the role on NCIS: Los Angeles.