Nickolai Stoilov

When Russia threatens to invade Bulgaria, Elizabeth must seek NATO's support. The alliance's existence is threatened however, when France refuse to cooperate.

Aunt Hilda must tutor Sabrina for the toughest magic test she has ever taken when Sabrina's complaints inadvertently get her Quizmaster fired.

A man breaks into Callen's house and ends up offering a lead; the team find a shipment of counterfeit computer chips.

Sydney's aunt, Katya Derevko (Isabella Rossellini), gives her devastating news; Vaughn steals a device to use as a bargaining tool in order to learn more about his father.

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.

Mike just happens to be away on business at the same time that Amelia is at her grandmother's house and Andrea finds herself home alone, for the first time in years.