20 Movie Reveals Nobody Noticed
8. Genetically Modified Kaiju - Superman (2025)
Mid-way through James Gunn's Superman, Lex Luthor (Nicholas Hoult) unleashes a kaiju upon Metropolis in order to distract Superman (David Corenswet) while he infiltrates the Fortress of Solitude with Ultraman (also David Corenswet) and the Engineer (María Gabriela de Faría).
The film never explicitly reveals precisely how Luthor obtained said kaiju, though when Mister Terrific (Edi Gathegi) scans the creature, attentive viewers can learn a little more about it.
Beyond listing the entity's dimensions, the scan also mentions that the kaiju has undergone genetic modification, with its DNA/RNA being altered by an unknown party.
It's not much of a leap to assume, then, that the villainous Luthor was responsible for this. While we still don't know where the kaiju came from, Luthor almost certainly captured and experimented upon them.
We can also deduce that this experimentation likely explains the creature's ability to grow from pint-sized to skyscraper-sized in a mere matter of minutes.
Knowing all this, the big guy's demise at the hands of the Justice Gang is even more tragic.