|Juan Diego Arnaldo|
Juan Diego Arnaldo is a former Basque terrorist being transported on a train between Paris and Zurich with a group of men. He is identified by first Chuck, via a flash, and then Sarah, who are AWOL aboard the same train after the emotional events of "Chuck Versus the Other Guy".
Sarah and Chuck attempt to find more information about him separately as they both think the other wants to quit the spy game. This follows both of them breaking into Juan's room, Sarah achieves this by playing drunk, and Chuck by climbing in through the moving train's window. They eventually tell each other about Arnaldo and propose to take him down in one last spy mission. They manage to drug his escorts and capture him with the help of Morgan and Casey. They then discover his escorts were Interpol, and two other agents had been murdered.
He later counseled Chuck and Sarah not to make the same mistake after overhearing them discuss their relationship concerns with Morgan and Casey, helped them realize that they could still be together without sacrificing their careers. As the new Interpol team arrives, Morgan casually starts to chat them up about Lake Como, which he studied extensively in his travel guide on the flight to Europe, and realizes they are not from Interpol when one of the agents makes a mistake by identifying an annual boating festival as "palaces" instead. The two are captured by Elia and her team who plan to kill Arnaldo.
Sarah and Chuck are then cuffed by the Interpol agents they drugged earlier, who assume that they are enemy agents, since the team sent to pick up Arnaldo was killed. Realizing that their friends are in danger and the agents won't listen to reason, they knock them out, take a moped and get back to the cafe. They crash the vehicle through the window, before engaging the ETA crew. In an interesting parallel Chuck and Sarah fight while cuffed and Casey fights while tied to Morgan.
Arnoldo is then taken into custody.
|See Also: Minor Characters • Season One Characters • Season Two Characters • Season Four Characters • Season Five Characters|