Sludge is a former antagonist turned supporting character in My Little Pony 'n Friends.
He is a former Lavan’s minion, Sludge turned against him after suffering Lavan's ill treatment. He then aliened with the ponies and their friends against Lavan. Another thing for his friends that he does is saving them and his people from Ice Ogre (the lavanes’ archenemies). This was marked by Spike shaking hands with him and the Ice Org leader, G'nash, at the same time, so Sludge done a great contact without suffering pain. The three then works together for making Lavan occupated while the other save Heart of Ponyland.
- The name Sludge was later used for a dragon in the Friendship is Magic series.