Boil one cup of hot water over high eat.
Add first Jello box (Grape for Hulk, Strawberry for Iron Man and Captain America)
Stir for 2 minutes until Jello is completely dissolved.
Stir in 1 cup of ice.
Pour evenly into 4 cups per super hero (If you are doing all 3 you'll pour in 12 cups)
Set up in fridge for 3-4 hours.
Boil one cup of hot water over high heat
Add second Jello box (Lime for Hulk, Pineapple for Iron Man, Blue Raspberry for Captain America).
Stir for 2 minutes until Jello is completely dissolved.
Stir in 1 cup of ice. Make sure liquid is cold to the touch.
Pour over first Jello in cups.
Let set up in fridge for an additional 3-4 hours.