Stephen. Lack.
I can overlook bad acting if the film is decent enough. Scanners had its great moments, but sweet merciful Christ, Stephen Lack is perhaps the WORST actor I have ever seen in a leading role!! Did this guy even audition? Absolutely terrible. Terrible, terrible, terrible.
Without the ending and the head-exploding scene, this would have been a stinker that could be blamed almost exclusively on this glassy-eyed monotoned joker.
...and what the hell was up with that ending? Sheesh! (my sig)