From the very start of TMNT: Shredder's Revenge, you can fight the Foot Clan using any of the six available characters. However, there's a seventh unlockable character, the one and only Casey Jones.

Quenching Acid is a limited supply item that allows you to upgrade Weapons. There are 11 to find all across Fallgrim on your first playthrough, but many more available in New Game+. Weapons can be ...