Boba Fett

The Star Wars Holiday Special is most popular known as the first appearance of Boba Fett.  Fett marked his entry into the Star Wars trilogy in 1980 with the Empire Strikes Back, but two years before that he was in the Holiday Special.  While in the special edition of A New Hope, Boba Fett was added into the Jabba the Hutt scene, his official first appearance was in the 11-minute cartoon that aired in the middle of the Star Wars Holiday Special.
In the screenshots below you can view the cartoon as it occurs, chronologically.