Undin is the main antagonist of the episode 3 "Nanay" from Shake Rattle And Roll 3. She has a dangerous saliva that will melt people. Undin shall find her eggs to go back to the water
Undin is the creature at the episode 3. Her eggs are taken away from her due to the students that participated to the field trip their tasks are to find water creatures that are rare and present it into class but Maloy's friend Sally stole the eggs of the Mother Undin and she showed it to Maloy and Sally squeeze the egg. After that Maloy got the eggs and put it in her cooler. Maloy's friend sally swim at the lake to find more of the eggs but before she can get few more eggs the undin drown Sally.