Milton the Monster first aired on ABC in 1966. It was definitely more funny than scary. The funny part may not have actually been all that funny; but anything with a cast of oddball monsters is and was fine with me. An excellent quality DVD is now available with all the episodes.
Milton the Monster # 1 published by Golden Key, in May 1966, is the only comic book version of the animated series. It seems a little lonely in my collection.
Over at Monsterama there is a nice post about Milton.