Nazi Germany (WWII) Invades the Mushroom Kingdom (Super Mario)
In 1940 after France's surrender, when the Nazi Bell was activiated, suddenly a massive green pipe with a circumference of 1 KM appeared on the ground, and it led to a whole new other universe. Germany wanted new living space, and found a way to get to some without needing to invade the Soviets. So Germany decided to invade this land and take it's resources. This land is the Mushroom Kingdom. Any personnal or assets the Germans send into it end up appearing facing rightside up and without any damage in the Mushroom Kingdom grassland areas within distant visual sight of Toad Town.
One day while Mario and Luigi were out doing the usual, they got a distress call! Strangely enough, the Princess was there this time to deliver the bad news: some human invaders have just appeared, and they were forcibly seizing small Toad villages! Mario, Luigi, Peach, Daisy, and Toad got their powerups and decided to fend off the invading army.
Could they fend them off?
Round 1: Just Mushroom Kingdom fights against them
Round 2: Bowser also helps them out against a common enemy.
Round 3: Rosalina also comes by to help (Note, she cannot just erase their galaxy or star, the Mushroom Kingdom needs to be intact.)
You can use movie canon as well for feats.
BONUS ROUND: Mario, Luigi, Peach, Daisy, Toad, Bowser, Bowser Jr, and Rosalina learn that their leader is in the human world they need to use a certain pipe behind enemy lines that would land them in the outskirts of Berlin. Can our heroes & heroines successfully raid Berlin and get to the Wolf's Lair to take down the enemy leader once and for all? They can use their Super Mario powers in the real world there.