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Mossland Monster is a gigantic creature that lives in the unexplored territory of the Mosslands on New Thundera. The creature, despite its massive size, is able to disappear into the surrounding moss and remain unseen. It is a vicious monster that attacks anyone who dares to enter its territory.
The Mossland Monster's body is made up of moss and it is capable of shooting beams from its eyes that turn anything they touch into moss. The beast also has the ability to regenerate lost and cut off limbs, making it virtually indestructible.
Tygra once encountered the monster when he crashed the Feliner in the Mosslands. The creature turned him into moss. When Lion-O, Bengali, Snarf, and Snarfer go to rescue Tygra, they too are turned to moss by the monster. Finally the Stone Giants come to the aid of the ThunderCats and destroy the Mossland Monster.
- The Mossland Monster could see Tygra even when he was invisible.
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