its called an ez-out, but yeah, that's what u need.
Or, if the metal is soft and the head is not stripped too too bad, you can take a flat head screwdriver and lightly hammer it into the stripped portion of the screw. This will cause the metal on the stripped part of the screw to bend and form around the screwdriver. Then turn the screwdriver out, and voila.
Confusious say: man going through airport turnstyle sideways is going to Bangkok