|Baleful Swamp Serpent|
|List of all creatures|
The Baleful Swamp Serpent is a giant, vicious snake like creature. The serpent was created when Vultureman fired the magical beams of the Totem of Dera into the toxic waters of Baleful Swamp. The body of the serpent is the same yellowish green color as that of the waters of the swamp. It has bloody red eyes and sharp teeth.
After Mumm-Ra armed the Mutants with the Totem of Dera, they set a trap for the ThunderCats at the Baleful Swamp. When Lion-O, WilyKit, and Snarfer arrived in the ThunderClaw, Vultureman used the Totem's power to bring to life the giant serpent which attacked the three Cats. It chewed up WilyKit's Spaceboard and caused the ThunderClaw to crash into the swamp. Later on Vultureman created multiple serpents using the Totem.