Nicolas Cage's Superman fights a giant spider — which was in the original plan for "Superman Lives."

Yes, Nicolas Cage really does appear in "The Flash" as Superman battling a giant spider with his heat vision.

In the scene, Superman is swarmed by a horde of mini spiders, before incinerating them with his powers and killing the giant arachnid. It's only then that he notices the multiverse opening up in a portal in the sky... 

The actor was actually meant to star in his own Superman movie back in the 1990s — titled "Superman Lives" — which was going to be helmed by "Batman" director, Tim Burton.

As per Jon Schnepp's 2015 documentary "The Death of 'Superman Lives': What Happened?" the film was going to be based on "The Death of Superman" storyline from the comic books.

The studio went through numerous scripts by the likes of Wesley Strick, Dan Gilroy, and Kevin Smith, but one of the main driving forces behind the film was producer Jon Peters.

Peters was adamant that the big finale should be something other than Superman fighting yet another costumed supervillain. Instead, he imagined something more horrific: a monstrous giant spider. 

Speaking to Schnepp about his plan for the film, Peters called it the "Thanagarian Snare Beast," before adding: "I stole it from Jules Verne's '20,000 Leagues Under The Sea.' This giant squid that tries to swallow up this submarine. So Superman would fight every tentacle— getting closer and closer to this beak — until he killed it. It would've made an amazing sequence! Amazing!"

Storyboard artist Tim Burgard drew sketches for the spider, which were featured in the documentary, and they showed how big the beast was meant to be. It looks like something right out of a "Godzilla" movie. 

Burgard explained that the spider would spit out mini creatures for Superman to fight, saying: "All these little face-hugger mini spiders are coming down and covering Superman. He's not going up against a supervillain, he's going against the Alien, or the Predator, or something that will try and kill him and maybe eat him or lay eggs in his eyeballs! That to me is super cool because it takes it to a different level that we haven't seen before."

It's clear that Andy Muschietti and writer Christina Hodson wanted to finally bring that whole sequence to life in "The Flash," mini spiders and all.

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