There was this movie I've watched when I was little...?

There was this movie I've watched when I was little...It was about a man who was a teacher,a scientist or something like that (it was a smart guy anyway),but in terms of physical strength not so good.And he somehow gets involved with a female special agent (or something like that) and have numerous adventures together.It was a TV series.I think it was called "Mr. and M..." (I don't remember the rest).
Can someone please give me the name of the movie?
 
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