Production for Shang-Chi and the Legend of the Ten Rings is underway in Australia and a new rumor circulating online suggests the film could feature one of the Marvel Cinematic Universe’s biggest villains yet. Surfacing from a source, the alien dragon known as Fin Fang Foom could end up appearing in the flick as a major antagonist. This isn’t the first time the fire-breathing baddie has been rumored to appear in the MCU, though it has been growing a substantial amount of steam this time around.

There’s been a popular theory based on the leak that suggests Shang-Chi (Simu Liu) will have to fight through an underground tournament of sorts, with Fin Fang Foom serving a role in the tournament. Depending on the source you follow, the character will either be participating in the tournament itself or will be something “unlocked” as a result of the tournament. Either way, the growing theory — again, based off a leak that could be nothing but fan fiction — ties Fin Fang Foom to this tournament.

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