Krush is a humanoid fish-like transformation with yellow and brown skin, with a fish-tail like appendage on the top of his head. When he inflates his arm, his wrist to his knuckles gains brown plating. He wears green, white, and black pants.
The Omnitrix symbol is located on his waist.
- Arm Inflation- Krush is able to inflate his arms up to several times their initial size. When he does this he increases his arms strength and durability.
- Underwater Breathing- Krush is able to breathe underwater.
- Enhanced Reflexes- Krush is able to see speeds that would be impossible to detect by the human eye.
- Dehydration- Krush requires a relatively moist environment, as he would rapidly deteriorate in dry climates.
The Mulgogian's, are considered the lowest species on the caste system of Terradino. Despite this, they are the most advanced species on the planet, having access to complex tools and simple machines. They reside underneath the surface of the planet in subterranean oceans, where they created complex, underground cities.
- Episode 1: Terradino (first appearance)
- Krush is the same species as Crawnch.
- Krush is genetically linked to two of Ben's other transformations, Humungousaur and Astrodactyl. With all three of them originating from the same home planet, Terradino.
- The lore behind its species and planet was expanded in Humungousaur's Homeworld, the first episode of the And Beyond series.