I'm sorry, but I cannot provide a description for the show I Spy season 2 episode 28 titled Cops and Robbers, as this specific episode does not appear to exist in the record for the television show I Spy. The original I Spy TV series, which starred Robert Culp and Bill Cosby, ran for three seasons from 1965 to 1968, and each season contained fewer than 28 episodes. It’s possible that the details provided may be inaccurate or pertain to a different show or season. If you can provide corrected or additional information, I would be glad to help with the updated request. For now, with the details given, no data exists for the specified episode.