Demon King Jackal

Demon King Jackal is the main antagonist of the 1975 manga The Ultraman and the 2015 short web animation The Ultraman: Jackal vs. Ultraman.

He was voiced by.

Biography
King Jackal was the leader of the Jackals, a race of mongering aliens who sought to conquer the universe. That was until they were brought to his knees by Ultraman King and banished into Hell's Black Hole to pay for their crimes against galactic civilization. However, in 1975, Jackal found his way out of his black hole prison, and immediately began his quest for vengeance.

First killing Ultraman in the form of Zetton, Jackal kills off the Ultra Brothers one by one until nobody is left to oppose his rule. The remaining Ultras hide themselves on Earth, which Jackal and his men invade to enslave humanity. He has his minions scout out the remaining Ultras, killing many innocent people to drive Zoffy out of hiding. That was until Melos, the captain of the Andromeda Nebula Branch of the Space Garrison arrived and defeated the Jackals on Earth. With the help of Melos, the Ultras fought against the Jackals straight to their homeworld.

Melos finally encountered King Jackal and engaged in a duel. Despite Jackal's ability to shapeshift into Alien Nackle, Black King, and Ace Killer, Melos gains the upper hand and uses his Andro Rang to cut off Jackal's left horn. Jackal feigns defeat and beckons for mercy. Melos agrees to this, but with his back turned, Jackal breaks Melos' left arm, deactivates his armor, and unleashes a powerful beam at Melos to finish him off.

Believing Melos to be dead, Jackal boasts how the entire universe was now his to control, only to see Melos emerge from the rubble. Jackal launches another beam at Melos, only for Melos to counter his beam with the M87 Beam, wounding Jackal and killing many of his men. Melos' armor comes off to reveal Zoffy, who thanks to Melos' intervention, revived the Ultra Brothers. Jackal scoffs this and claims he will send them back to Hell where they belong and fires another beam, only for the Ultra Brothers to combine their beams to obliterate Jackal. With their king dead, the Jackals surrender, bringing peace to the Galactic Republic.

Trivia

 * Jackal's name was inspired by The Day of the Jackal by Fredrick Forsyth.