The Lady With the Mystic Smile is a fanfic written by Lucky Ladybug, and published at Fanfiction Net and Archive of Our Own on 5 June 2017. It takes place between seasons 7-8 in the 1987-1996 animated TV-series. It is part of the Exit the Fly fanverse.
Plot[]
The Ninja Turtles and Baxter Stockman break into the Technodrome to take the retromutagen ray back and cure Mona Lisa's mutation.