Leo, Raph, Donnie, and Mikey go to a comedy show at Madison Square Garden, where they meet five-and-a-half-year-old Shireen Baris, and run into two of their archenemies, Chris Bradford and Xever. Part 1 of the "X-Over Adventures in NYC" series. This is a repost of a fanfiction I wrote on Archive of Our Own, and Writers Cafe, under different usernames. Slight cursing in a chapter or two. Shireen is an OC of mine. Lastly, this fanfic was inspired by an episode of World's Dumbest.