Y.E.T.I.

Y.E.T.I., also known as the Tundorian Y.E.T.I. in Deadlocked, were large, ferocious creatures that Ratchet and Clank encountered on planet Grelbin's icy tundra. Clank encountered them again on the Ski Slopes of Glaciara. They were genetically created by Megacorp to hunt down and kill the Arctic Leviathans, that roam the planes. That was the original idea, though, because since their creation, they had gotten out of control, and now live free in the arctic landscape.

Grelbin
Seemingly working together with the Leviathans, on protecting the Moonstones on the planet, the Y.E.T.I would agressively pounce on anyone disturbing their territory, striking them with their claws. They will also jump up from deep pits, possibly indicating an underground concentration of the Y.E.T.Is.

A huge problem for Ratchet was, that sometimes as much as 25 Y.E.T.Is would attack him, if he didn't kill them immediately as they jumped out of their pit; the whole screen could be filled in mere seconds, if they were not disposed of quickly.

Unnamed Ice planet
A Y.E.T.I. appeared on the Ice planet in Up Your Arsenal attacking Agent Clank and then destroying a Ninja Bot.

Glaciara Ski Slopes
Y.E.T.I. appeared on the Ski Slopes of Glaciara when Clank was trying to escape from security bots. They threw rocks at Clank while he was snowboarding.

Uses
Y.E.T.I. hair was known to be incredibly strong, which why is why it was harvested by some individuals and corporations. Vox Industries was known to use Y.E.T.I. hair in its Versa-Wrench Multicore's core, making the Wrench both lightweight and powerful all at the same time.

Trivia

 * A Y.E.T.I. made a cameo in Ratchet & Clank: Up Your Arsenal, in the new Secret Agent Clank premiere.
 * If there a few Y.E.T.I.s around a Leviathan, the Leviathan will occasionally reach down and eat a Y.E.T.I.Endorsement Deals - YETI Soda.jpg
 * Unlike the enemies guarding the crystals on Planet Tabora, Y.E.T.I.s will reappear after you defeat them if you leave the planet, reload your game, or die.

Appearances

 * Ratchet & Clank: Going Commando
 * Ratchet & Clank: Up Your Arsenal  (cameo)
 * Secret Agent Clank