For the uninitiated, Rima, the Jungle Girl had appeared in a short-lived series from DC when the company acquired a license to use the character around 1973. 4 years later, Rima finally had the chance to meet one of DC's most famous icons, Wonder Woman, on The All-New Super Friends Hour, in the episode, "The River of Doom". Narrator Bill Woodson doubles as one of the explorers, and Olan Soule, normally the voice of Batman, is heard as part of the explorer team as well.
I am not sure when DC's license to use Rima expired, so if it had by 1977, then it had to have fallen upon Hanna-Barbera to gain a license of their own, or in conjunction with DC. Rima would appear at least once more that season, and I believe she may have been brought back a few years later, but by then, the licensee would be H-B alone.