The crux of this theory making its way up the Reddit threads is that when he obtained omnipotence with the Infinity Gauntlet ... Having Galactus be the creation of Thanos would be a major retcon ...

And there was a time in the comics, shortly after he wore the Infinity Gauntlet ... when Thanos realized he had been played by Annihilus, he set in motion plans to free an imprisoned Galactus ...

When Thanos finally comes to Earth to complete his Infinity Gauntlet, Thanos gets slain ... knew that Marvel fans would draw the Galactus association from this Ultron scene; by now, fans should ...

If the fact that Thanos is a pretty terrifying character hasn't been conveyed by the hype for Infinity War, then surely the fact that he took down Galactus will. In the original Infinity Gauntlet ...

Instead, jlefrench believes that Galactus destroyed Titan, consuming its core and leaving nothing but wreckage in his wake. “Thanos, being ‘cursed with knowledge’ figured out that Galactus ...

How about beating Galactus and all the cosmic gods at the same time? Everyone knows that when Thanos got his hands on the Infinity Gauntlet he used it to eliminate half of all life in the universe ...

Despite initially defeating Galactus, Thanos later finds himself vulnerable, pleading for his life without his infinity gauntlet. King Thor utilizes the power boost to finally destroy Galactus ...

Alright, so who is Galactus? I've never heard of him ... and is still one of the brand's toughest villains. Thanos, even with the Infinity Gauntlet, doesn't even compare. That's how tough this ...

Thanos does manage to defeat them all; Galactus, Kronos ... She takes the chance and yanks the Infinity Gauntlet from his abandoned body. Nebula then uses the Infinity Gauntlet to restore herself ...