Nergalings are small (just a bit smaller than Billy and Mandy) creatures that look like Nergal. They are mutant/monsters just like Nergal. They appear in Love is Evol Spelled Backwards, rushing out when Nergal's house/spaceship/car door opens. They also appear in Something Stupid This Way Comes, where Nergal fails to make friends again, and uses his tentacles to turn everyone into mutant/monsters. If you look really closely at the part where Nergal sings "Friends", the mutant/monster directly behind him is a Nergaling.