Birdman and the Galaxy Trio

Birdman and the Galaxy Trio is a superhero action cartoon created by Hanna-Barbera in 1967. It was a package show that paired segments for the superhero Birdman with segments detailing the intergalactic adventures of the Galaxy Trio.

Space Slaves (Episode 15)
Gravity Girl is enslaved by a tyrant who wants to use her scientific skills to build a mind control machine. The trio later turn the tables on the tyrant and force him to destroy his own machine.