Challenge 16
Invincible Fallout Crossover Challenge
After spending a few centuries in a vault, Mark, Atom Eve and the descendants of fellow heroes decided to leave their vault and explore the wasteland and carve out a slice of paradise for themselves.
Rules:
Hostile environment and governments
Challenge 17
Invincible Starship Troopers Crossover Challenge
The arachnid menace has declared a genocidal war against mankind. Luckily for humanity there are super powered individuals standing between them and the total extinction of the human race.
Rules:
Has the rare super powered bug
Viltrimites have their attention divided between fighting the arachnids and conquering the cosmos
Mark is loyal to humanity
Humanity doesn't have a fascist government
Multiple alien races
Challenge 18
Invincible Big Hero 6 Crossover Challenge
There is a new hero team in San Fransokyo and Cecil gets them a new hero tutor, Mark.
Rules:
Clueless teacher Mark
True friends
Challenge 19
Invincible Resident Evil Crossover Challenge
Umbrella officially collapsed after the T-Virus ravaged Raccoon City. Unofficially their scientists who created the virus continued their research in secret, until the virus rears its ugly head again.
Rules:
Has infected Supers
Takes place after Omni-Man left Earth
Challenge 20
Invincible Teenage Mutant Ninja Turtles Crossover Challenge
At a young age Mark witnessed his dad killing his mom, in fear Mark ran away and found himself hiding in the sewers of New York and found by young 4 anthroportic turtles. So they took him in and their rat sensei trained in the art of ninjutsu. Now years later his powers kicked in and his past decided to return.
Rules:
Experienced Mark
Poor relationship between Nolan and Mark
Challenge 21
Invincible Gravity Falls Crossover Challenge
Dipper and Mabel may seem like your typical preteens but they have a secret, they are the twin children of Omni-Man.
Rules:
They may have powers but they don't have them when they get to gravity falls
Starts before the Invincible series
Challenge 22
Invincible One Piece Crossover Challenge
After a battle with Angstrom Levy, Mark winds up in the world of One Piece and due to a series of misunderstandings, Mark has to team up with the Straw Hat Pirates to learn about the new world he is in and find a way home.
Rules:
Mark joins Straw Hats before or during the events of Enes Lobby
Mark faces various challenges in the One Piece world
Challenge 23
Invincible Alien/Predator Crossover Challenge
Shortly after Omni-Man left Earth, leaving a battered and bruised Mark, the GDA managed to find an ancient spaceship hidden on Earth. So Cecil sent both agents and scientists to figure out its secrets and doing so let the Xenomorphs out of the ship.
Rules:
The Xenomorphs give the GDA and the Guardians a lot of trouble
Xenomorphs blood can hurt Mark
Yautja's (Predator) may appear
Challenge 24
Invincible Big Bang Theory Crossover Challenge
After finishing college, Mark manages to get a job at the California Institute of Technology. Can Mark keep his civilian and heroic lives separate from the others at his job, and can he keep up with the antics of the scientists.
Rules:
The characters of the Big Bang theory are suspicious of Mark after his frequent disappearance while on the job
Mark is or will live in the same complex as Sheldon
Challenge 25
Invincible RWBY Crossover Challenge
The Grimm has somehow managed to find their way to Earth and spread across the globe in a short amount of time. How can the GDA and various heroes react to the new threat?
Rules:
Grimm causes trouble around the globe
Post Omni-Man left Earth