14. Chuck Versus the Honeymooners

Complete story — includes the ending

While travelling to Zürich (trying to escape their spy lives), Sarah and Chuck realize they're traveling on the same train as Diego, a Basque terrorist, and his companions. Even though they're all alone, they decide to take on these rogue agents behind each others back. They each realize that the other is also on the case and work together, posing as a Texan couple on their honeymoon. Of course, this impromptu mission doesn't go smoothly as it turns out that the "terrorists" accompanying Diego are actually undercover Interpol agents guarding him. Meanwhile, Beckman orders her newest "unlikely" spy team – John Casey and Morgan Grimes – to track down the missing couple. The duo succeeds and they catch up with Chuck and Sarah, just in time to help them fight off true Russian spies who used to work with Diego (and are now trying to eliminate him). Meanwhile, Ellie is upset Chuck doesn't come for her going away party. In the end, Chuck and Ellie reconcile and he and Sarah agree to date while remaining spies. They admit this to the General, who warns them of the dangers, while also congratulating them (unofficially).