Written by Chevy Chase (writer), Mort Drucker (artist)
Issued 04/1970
Printed in Mad Magazine #134. A short one-page satire of the TV series. Mr. Phelps (Peter Graves) gets an assignment that is quite unexpected.Note: This comic story was reprinted in Mad Super Special Spring 1981. in Mad About TV in 1999, and in Totally MAD in 2012.
Here are the pages I have of it.