Visitors turn guest stars on the set of Adam 12 at stage 70 - Universal

 

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Wikipedia: Adam-12 was an American police procedural crime drama television series created by Robert A. Cinader and Jack Webb and produced by Mark VII Limited and Universal Television. The series follows Los Angeles Police Department (LAPD) officers Pete Malloy and Jim Reed as they patrol Los Angeles in their police cruiser, assigned the call sign "1-Adam-12". Adam-12 stars Martin Milner and Kent McCord, with several recurring co-stars, the most frequent being William Boyett and Gary Crosby. The series ran from September 21, 1968, to May 20, 1975, over seven seasons.