Carl Lumbly, who voices J'onn' J'onzz's brother here, previously played J'onn J'onzz's father on 'Supergirl', and voiced J'onn J'onzz himself on the animated 'Justice League' series.
The blonde girl wearing the Legion Flight Ring makes another appearance. She is seen observing the heroes as they board the ship but again her face is not seen.
Martians have darker sclera to allow more light in due to the darker environments underground.
If you convert the names of the M'orrz family to human dialect they would be Emery, Jane and Matt.
Beast Boy has to stay in his alien animal form on Mars. His lungs can't handle the environment normally.
Conner is half Kyptonian. So he is able to handle the environment albeit getting weaker.
Conner is half Kyptonian. So he is able to handle the environment albeit getting weaker.