Early concept art from Taika Waititi's Thor: Ragnarok has already revealed alternate designs for Surtur and Hela. Now, Marvel Studios' Senior Illustrator Jackson Sze has shared a very Kirby-esque design that was pitched for the God of Thunder's gladiatorial armor.

RELATED: To Infinity And Beyond: 15 Fan Theories About The MCU After Thor: Ragnarok

"A character like Thor can go through many rounds of designs during pre-production," Sze explained on Instagram. "By exploring possibilities we hope to ultimately reach an appropriate design that speaks to a character's story. During this particular round of design, @taikawaititi was pushing us to give Thor the Jack Kirby aesthetics while he was a gladiator on Sakaar. Even though some of our designs may seem exaggerated, they are often a necessary point of exploration for us to find his final look."

The armor looks quite different from the final product in the movie, though the helmet is pretty similar. This early version puts a sleeve and pauldron on Thor's left arm and shoulder, respectively. The front of the armor also sports a more intricate design than the movie version.

Often regarded as one of the greatest comic book artists of all-time, Jack Kirby is famous for co-creating a number of comic book characters -- including Captain America with Joe Simon, the Fantastic Four with Stan Lee and the villain Darkseid for DC Comics. Waititi mentioned in September that the film drew from Kirby's style. In October, Marvel Studios President Kevin Feige called the film an "unabashed love letter to Jack Kirby."

Thor: Ragnarok recently passed $700 million at the worldwide box office and is closing in on the $800 million mark. The movie has been well-received critically, earning a 92% from Rotten Tomatoes.

In theaters now, Thor: Ragnarok is directed by Taika Waititi and stars Chris Hemsworth as Thor, Tom Hiddleston as Loki, Cate Blanchett as Hela, Idris Elba as Heimdall, Jeff Goldblum as Grandmaster, Tessa Thompson as Valkyrie, Karl Urban as Skurge, Mark Ruffalo as Bruce Banner/Hulk and Anthony Hopkins as Odin.