Fox 21 Television Studios

The stakes have never been higher for KGB operatives Philip and Elizabeth Jennings than in this pulse pounding fourth season. Still grieving the death of her mother, Elizabeth berates Paige for telling her pastor about her parents' covert profession. A deadly bioweapon threatens Gabriel's life, and the couple shatters the lives of loved ones when Martha is told Clark's true identity and Elizabeth betrays her friend Young-Hee.