From Wikipedia:

Fraggle Rock is a children’s television series with a total of 5 seasons and 96 episodes that originally ran from January 10, 1983 to March 30, 1987 on HBO in the United States, CBC Television in Canada, TV2 in New Zealand and ITV in the UK. It was later shown in the UK on Boomerang and Cartoonito. In 2008, Fraggle Rock is showing in the UK on POP! and Tiny Pop, in Australia on Boomerang and in Canada on Teletoon Retro. The series was created by Jim Henson, primarily featuring a cast of Muppet creatures called Fraggles, with music by Philip Balsam and Dennis Lee. It was one of the first shows to be co-produced by HIT Entertainment since its foundation in 1989 when it was called Henson International Television, the international arm of Jim Henson Productions.

The vision of Fraggle Rock articulated by Jim Henson was to depict a colourful and fun world. Also a world with a relatively complex system of symbiotic relationships between different “races” of creatures, an allegory to the human world, where each group was somewhat unaware of how interconnected and important they were to one another. Creating this allegorical world allowed the program to entertain and amuse while seriously exploring complex issues of prejudice, spirituality, personal identity, environment, and social conflict. Fraggle Rock generally refused to over-simplify any individual issue, instead simply illustrating the consequences and inherent difficulties of different actions and relationships.

The show was a worldwide hit, like Sesame Street and The Muppet Show. The “Fraggle Rock Theme” reached number 33 in the British charts during the phenomenon.

From Wikipedia:

The Greatest American Hero is an American TV series which aired for three seasons from 1981 to 1983 on ABC. It premiered as a two hour movie pilot on March 18, 1981. It starred William Katt as teacher Ralph Hinkley (or Hanley), Robert Culp as FBI Agent Bill Maxwell, and Connie Sellecca as lawyer Pam Davidson.