Invasion gauntlet: Sci-fi vs Superheroes.
An invasion force composing of:
millions upon millions of Arachnids (Starship Trooper) mixed complement (similar makeup as the Klendathu invasion, has brain bug, god bug and queen controlling them as well)
100,000 Xenomorphs (Aliens)
50,000 Martians (Mars Attacks! 1996)
5,000 Predators (Predator)
300 Martian ships (Mars Attacks! 1996)
100 Tripods (War of the Worlds)
10 category 5 Kaiju (Pacific Rim)
1 Mothership (Independence Day: Resurgence) with full complement of ships/troops/etc.
Runs the gauntlet:
ALL characters (villains and heroes) join together to fight off the invasion. No outside help is provided. Only the characters based in the worlds are the only ones allowed. No prep. BUT they are allowed to send a delaying force to fight off the invasion force as they try and build something. Characters who died in movies are considered alive for this battle.
All "plot devices" victory paths are removed (no virus can kill the Tripods, no computer virus is going to hack the Mothership, no time travel shenanigans, etc).
1) DCEU Earth
2) MCU Earth
3) MCU Earth and Asgard
4) MCU Earth, Asgard and the Nine Realms (includes Surtur, Frost Giants, Dark Elves, etc).
5) DCEU and MCU Earth, Asgard and the Nine Realms
6) DCEU, MCU Earth, Asgard, the Nine Realms and CW DC TV series Earth.
7) DCEU, MCU, Asgard, the Nine Realms, CW DC TV series Earth and X-men Earth.
8) DCEU, MCU, Asgard, the Nine Realms, CW DC TV series Earth and X-men Earth (future Sentinels allowed).
9) DCEU, MCU, Asgard, the Nine Realms, CW DC TV series Earth and X-men Earth (future Sentinels allowed) and Fantastic Four Earth (Surfer allowed, no Galctus).
10) All of the above plus Reeves Superman and Smallville Superman.
11) All of the above plus Thanos and his forces and the Infinity gauntlet.
Fight happens in our version of Earth. Comic universe teams are teleported to the surface of our planet and all inhabitants are placed in hundreds of thousands of bunkers similar to those in Pacific Rim.
Bear in mind the invasion force wins when the entire planet has been subjugated or if the entire population is killed.
Defending force is made aware of the invading force as they approach the Earth's moon. Defending force is assumed willing to work together and are battle-ready. Best version of characters allowed.
How far does the invasion force get?