It was the same guy, Tobin Bell. He just had a deeper voice.
The bad guy is the Lizard.
A horror movie released in 2002 named 'Jigsaw' had Brian Ellis playing 'Jigsaw'. Not to be confused with 'Jigsaw' of the Saw series.
Thanos
no very bad movie if your a guy
Faster.
Loki, Thor's brother
Voldemort?
Gaston the hunter
go to dragonart.com
All of the Saw films have Jigsaw in them, but from Saw 5 on you only see flashbacks of him, as the character is dead.
Die Hard (1988)