Heathcliff is an animated TV series that debuted on October 4, 1980. It was the first series based on the Heathcliff comic strip. It ran until September 18, 1982 with a total of 25 episodes, under two different names.
The first season ("Heathcliff and Dingbat") ran for 13 episodes and included backup segments with Dingbat and the Creeps, who was created for the show. Dingbat and the Creeps was a Halloween-themed cartoon where Dingbat, a vampire dog, Spare Rib, a skeleton, and Nobody, a jack-o-lantern were deported from Transylvania for not being evil, and made their way trying to help others.
The second season ("Heathcliff and Marmaduke") ran for 12 episodes and featured backup segments with fellow comic strip character Marmaduke (although the Marmaduke segments are actually the first to be seen in each half-hour show).