Read more about Jormungand (Marvel) at: Wikipedia

Official Site: Marvel

Jormungand, also known as The Midgard Serpent or World Serpent, is a fictional character that appears in comic books published by Marvel Comics. The character was created by Gerry Conway and John Buscema and first appears in Thor #200 (June 1972).

Based on the creature of the same name from Norse mythology (often referred to as "Jormungand"), the Midgard Serpent first appears in the period between the Golden Age of Comic Books and the Silver Age of Comic Books.

The Midgard Serpent debuted in Marvel Tales #105 (Feb. 1952) and was then tied firmly to Marvel continuity in the Bronze Age of Comic Books in Thor Thor #200 (June 1972). As in Norse mythology, the Marvel version of the Midgard Serpent is the nemesis of the Thunder God, who has two encounters with the creature - the events based directly on mythology - in Thor #272 - 273 (June - July 1978).

An attempt to cheat the fatal prophecy made regarding a final battle between Thor and the Serpent occurred in Thor #274 - 278 (July - Dec. 1978), although the creature returned in Thor #325 (Nov. 1982 - Jan. 1983). A "larger than life" battle between Thor and the Serpent was depicted in Thor #379 - 380 (May - June 1987), with writer-artist Walter Simonson using a splash page to depict the creature's size, and then full pages to demonstrate the battle between the pair.

Jormungand (Marvel) has not been a contender in any CBUB matches.