Kronis is the original identity of Trap Jaw. One of the fearsome and evil warriors of Keldor, Kronis is a tertiary antagonist of the television series, He-Man and the Masters of the Universe. He appears only in the prequel that explains the origin of the Disney VS Non Disney Villains War.
Disney Vs Non-Disney Villains War
Before there was Trap Jaw, there was Kronis, Kronis grew up poor. Times were growing desperate, and Kronis knew he had to make money for his family somehow. Against his mother's wishes, he resorted to piracy, and signed in to be a member of Long John Silver's crew.
Kronis quickly rose through the ranks, becoming Silver's first mate, much to the envy of fellow crew member, Scroop.
Scroop decided to get rid of the rookie. Clutching Kronis's neck with his claw, Scroop gave an extremely brutal beating to Kronis. Afterwards, he threw his mutilated, destroyed body off of the ship.
The heavily injured pirate was found by Keldor, a conqueror from a distant place, he repairs Kronis' body, in exchange of serving him in his upcoming battles.
Pre War Vs The Archmage
Kronis is one of Keldor's warriors, presented in the battle against Destane, the Archmage. As Kronis and Tri-Klops charge to him, the Archmage fires them back with a spell. When Keldor is severly injured, Kronis, along with the remain evil warriors, is forced to retreat from the citadel. He does not make another appearance in the prequel, thus the reason of changing to his counterpart, Trap Jaw, in the later events of the war, remains unknown. The rest of his biography can be found here.
Non Disney Villains Tournament
Kronis makes a brief appearance at the Battle of Keldor against Skullmaster. He does not appear in the later events, until one point, before he would meet King Haggard, he somehow gives up his original identity and becomes his upgraded counterpart, Trap Jaw. To see the rest of his bio, see here.