You fool! I saved you! Before any of you were even born, I realized we do not have time to raise hatchlings. And the males? Ha! They never helped. Always dancing and playing. That is why we must throw them away! There must be order!
~ The Supervisor revealing her true colors.
The Supervisor is the main antagonist of Disney's 2011 motion-capture animated film Mars Needs Moms, which is based on the 2007 book of the same name by Berkeley Breathed. She is the ruler of Mars who abducts Milo's mother because of her "momness", her motherly usefulness.
She was voiced by Mindy Sterling.
The Supervisor is first seen with Ki, a graffiti artist. They are watching down on earth looking for a mother that is useful enough to take care of their Martian babies, as they are not allowed take care of them for themselves, according to the Supervisor. She spots Milo's mother, who is seen arguing with her son to take out the trash, the Supervisor choose her.
That night when Milo was sent to bed as punishment for feeding broccoli to the cat, his mother gets abducted by the aliens and he follows along. He boards a Martian spaceship and is taken to Mars. During his quest to save his mother he meets Ki and Gribble, aka George Ribble, childish adult who too has taken hostage long ago. Gribble explains that Martian female babies are currently raised by nannybots with the memories extract from other mothers, while the male babies are sent down to the dump to be raised by adult male Martians, which are the furry creatures that Milo encountered earlier. So the gang decide change how Mars works, fight the evil, repressive system and stop all the mothers from being destroyed.
Gribble explains his mothers abduction from 20 years ago and when the mothers outuse their usefulness, they just blow them up with a beam from the sun. Gribble tried to save his mother from her execution, but it was too late. Gribble blames himself for his mother being abducted, and regrets that he hadn't been able to save her. Milo convinces Gribble to help him find his mother before it's too late.
Milo manages to save his mother and they try to escape across the Martian surface, but the Supervisor shoots Milo's foot, causing him to trip and shatters his oxygen helmet. His Mom gives him her own helmet, sacrificing herself to save Milo. The Martians are awed, as this is the first time they have experienced love. Gribble finds his mother's old helmet buried under some dirt, and gives it Milo's Mom, saving her life. Ki brings a ship for them to escape in, but the Supervisor steps in and they're surrounded.
Ki reveals that the Supervisor lied to them by showing them an ancient mural of a Martian family that she discovered earlier, showing that Martians were meant to be raised in families, with love, but the Supervisor insists that the current system is better, because it is more efficient. The guards decide to turn their backs on the Supervisor and have her arrested for her evil-doings. The Martians celebrate and they start a new life taking care of the children as a family.
In the post-credits scene, the Supervisor is scene changing a Martian babys diaper, only for the diaper to fall off and gets urinated in the face.