Due to some sort of cosmic joke, or the meddling of an undisclosed powerful being, the following families of powerful individuals are transported to and stranded in the MCU, shortly before the start of the Avengers film.
How will their presence affect the MCU and its development? What will be S.H.I.E.L.D.'s (and HYDRA's) reaction to their sudden appearance and the power imbalance they represent? Will they succeed in returning to their respective realities, and will all choose to return?