Chuck Versus the Honeymooners

S3, E14: While in Europe, Sarah and Chuck realize they're traveling on a train with Spanish spies. Even though they're all alone, they decide to take on these rogue agents, but this impromptu mission does not go smoothly. Meanwhile, General Beckman (recurring guest star Bonita Friedericy) orders her newest "unlikely" spy team -- John Casey and Morgan Grimes -- to track down the missing couple.