Super Friends (1973)

S3E3 The Demons of Exxor

The Wonder Twins decide to assist Exxor in its battle against Darkon, a tyrant who has enslaved the planet's residents. However, when Darkon captures the twins, it's up to Batman and Robin to rescue them. Meanwhile, the rest of the Super Friends engage in a fight against Darkon and his soldiers to reclaim Exxor.