Despite the air dates listings you see all over the internet, Spider-Man and his Amazing Friends did not air in production order. Episodes were mixed up and re-runs aired before the first run of the season had completed. For example, 'The Vengeance of Loki" was the 10th episode but aired on the 9th Saturday, 11/7/81. The next week, a re-run of "Triumph of the Green Goblin" aired on 11/14/81. Many of the original air-dates are still unknown.
In 1981, Ruby-Spears pitched a Thor animated series under the direction of co-creator Jack Kirby.