How do you use the super zapper in Lego Star Wars 2?

Answer 1

Walk up to some kind of clone trooper or imperial stormtrooper or officer, close enough, then press whatever button you press to fire your blaster or swing your lightsaber, and you should kill them in one slap.

Answer 2

To use the super zapper, shoot like it's a regular blaster. instead of shocking droids, you can kill them. Some characters can be shocked.