In the opening scene of TENET, the protagonist is part of a covert mission during a terrorist attack at a Kyiv opera house. As he moves through the building to extract an informant, strange time anomalies occur, including an inverted bullet. After completing the mission, he is captured, refuses to betray his team, and takes a cyanide pill, which turns out to be a test by the secret organization TENET. This scene sets the tone for the movie's exploration of time manipulation and high-stakes espionage.