Corrected entry: They don't even need to inject anything to return Kevin Bacon to normal, all they need is to shock the hell out of him. If you notice the gorilla when they use the paddles on her she becomes visible. Also at the end of the movie Kevin Bacon is made partially visible after he was electrocuted. A few more shocks and he would have been fine.
Piemanmoo
27th Aug 2001
Correction: Yes, but a few more shocks would probally have killed him too.
Piemanmoo