|Location||Below Antropolis City|
The Hydra Beast is a massive beast with three heads from Invasion From Below.
Although this Beast is not seen at all in the episode, it appears in the comics attacking the Heroes.
Hydra Beast has translucent azure bones. His feet have plasma claws like the Splitter Beast's. It has one normal hand and one big claw that can open and close, as well as a long tail. It has three heads, those being the ones from the Flyer Beast and the Splitter Beast.
In set form, the Beast is a combination model of the Splitter and Flyer Beasts.
- Out of all the Beasts, it has the most heads.