"Parity," the third episode of Alias (2001), follows Sydney Bristow to Madrid, where she attempts to secure a sketch by Milo Rambaldi, marking the introduction of the series' central mythology and rival agent Anna Espinosa. The episode, which highlights Sydney’s escalating conflict between her double-agent duties and personal life, also features a tense, temporary alliance with K-Directorate. Read the full recap at Alias Fandom Wiki . "Alias" Parity (TV Episode 2001) - IMDb

Trivia. First reference to Rambaldi and first reference to Anna Espinosa. Goofs. When Sydney is chasing Anna through the basement, 1.3 Parity