If you already had a hard time keeping track of what is and what isn't part of the Marvel Cinematic Universe, this might not be the article for you. We're about to take a deep dive through the multiverse and explain some hidden connections between the MCU and other fictional worlds from film and television. As Tilda Swinton's Ancient One said in Doctor Strange...
At the root of existence, mind and matter meet. Thoughts shape reality. This universe is only one of an infinite number. Worlds without end.
Bear in mind, many of these connections originate as inside jokes and were intended to represent nothing more. Still, if you can't find new ways to headcanon your way through a truly mighty Marvel Multiverse, what's the point of being a comic book fan in the first place?
James Gunn gave his own sci-fi creature feature a nod with the inclusion of Slither's alien slugs in the first Guardians of the Galaxy. They can be spotted in one of the cases in the Collector's lair alongside specimens like Howard the Duck and Cosmo.
Does that mean that the events of the 2006 film actually occurred in the MCU? If you want it to, sure! While there's nothing in Slither to definitively link it, the 90s setting of the upcoming Captain Marvel seems to suggest we know a lot less about the pre-Iron Man days than we think.
Then again, it's also entirely possible that the Slither slugs are a species that can be found throughout the multiverse and/or pulled in from a parallel reality. After all, poor Howard's presence in the MCU has the fowl fellow trapped in a world he never made.