Aside from my Loud House + X-Men idea, here's another idea I recently came up with:
The Loud family is on vacation to New York. Lincoln, as usual, gets into a little mischief and ends up falling through a roof and into someone's house unexpectedly, or so he thinks. Turns out he is in the home of Dr. Stephen Strange. While the two have never met, Strange acts as if he was expecting the boy. It is soon revealed that Strange is a master of the Mystic Arts and can perform extraordinary magic. As a young aspiring magician, Lincoln is fascinated by what the doctor can do and begs him to take him on as his apprentice.
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