I saw The Nude Bomb in 1980, and was highly disappointed. This made-for-TV movie is better. It doesn't totally recapture the goofiness of the original series, but it makes a good effort. All of the crazy characters are back with the exception of The Chief (the actor who played this character passed away in the mid-1970's). There are some scenes in this movie where the characters look as if they haven't missed a step from who they were in the original series. I would suggest skipping The Nude Bomb entirely, and watching this one instead.
Review of Get Smart, Again!
