Nickolai Stoilov

Callen finds himself embroiled in a case involving a shipment of counterfeit computer chips and a former KGB operative who could hold the key to his past.

In the season finale, Elizabeth steps in when France refuses to co-operate with NATO over a potential Russian invasion of Bulgaria.

Daft Aunt Hilda (Caroline Rhea) tutors Sabrina (Melissa Joan Hart) for the toughest magic test she has ever taken.

Katya unsettles Sydney when she tells her that someone framed her mother. Vaughn becomes a rogue agent by getting involved with the people who might know his father's whereabouts.

Maura and Ali unearth new truths about their family, Shelly becomes bold in her improv class, and the past haunts Josh. Sparks erupt between Sarah, Lila and Len.