Underdog Came out with a series of comic books.
The first series was made by Charlton from 1970-1972.
Only 10 issues were produced. They were just remakes of classic episodes in comic form. This series is a little hard to find. I am only missing a couple of issues. Looking for #4 & #5.
Second series was produced by Gold Key/Whitman.
This series ran for 24 issues from 1975-1979. The only decent artwork is the cover. Most of the stories were silly and weak. I personally have the complete run in mint condition.
Spotlight Comics did a 3 issue run in 1987
I have all these comics.
Harvery did a one-shot in 1993
I have this one also.