In the fall of 1979, the Super Friends returned to their prior format and brought back the original set of five DC Superheroes along with Zan, Jayna and Gleek. Back to an hour in length as well, only eight new episodes were created during this run, with the majority of the season consisting of repeats of The All-New Superfriends Hour from 1977-78. Renamed The World's Greatest Superfriends, this series began on September 22, 1979 and ran until September 27, 1980.
Runtime: 30 minutes
The World's Greatest SuperFriends - Challenge of the Super Friends - Netflix
Challenge of the Superfriends is an American animated television series about a team of superheroes which ran from September 9, 1978, to December 23, 1978, on ABC. The complete series (16 episodes) was produced by Hanna-Barbera Productions for Warner Bros. Television and is based on the Justice League and associated comic book characters published by DC Comics and created by Julius Schwartz, Gardner Fox and Mike Sekowsky. It was the third series of Super Friends cartoons, following the original Super Friends in 1973 and The All-New Super Friends Hour in 1977. It continued to air on Boomerang in the United States until February 2, 2009.
The World's Greatest SuperFriends - Legion of Doom - Netflix
Thirteen villains comprise the Legion of Doom during the Challenge of the Super Friends season. They are: Despite the claim in the program's title sequence that the Legion's members hail from “remote galaxies”, only Brainiac and Sinestro are extraterrestrials; the remaining members are all natives of Earth (Even though Bizarro called Bizarro World home he was created by Lex Luthor via duplicator ray on Earth technically making him a 'native' of Earth). Solomon Grundy is a zombie, an animated dead person, as the episode Monolith of Evil makes clear. In History of Doom, even Solomon Grundy supposedly dies from the solar flare.
The World's Greatest SuperFriends - References - Netflix