"Resetting" Character Sprite

Is there a call script or something I can use to revert to the last saved character sprite, rather than having to use a conditional branch for every possible sprite you can have? (Certain events PERMANENTLY change your character sprite, but you still show up as a different sprite on the world map, and then revert when you leave that map)

Im ASSUMING a call script would do it, but I'm not sure how to write those.

to clarify: I need a simple command I can put into events that leave the world map that return your sprite to whatever it was before you entered the world map.

Anyone?

You could do this with variables, but you'd need a lot of settings. If there isn't many things the person can turn into, you can just do a conditional branch to check if the variable = 1, he will become a cat. If variable = 2, he will be human. Make sense?

thanks, but are you positive thats the simplest way?