Nothing can match the brilliance of David Cronenberg's original Scanners, but this first sequel does a good job of coming close.
The plot is essentially the same. Nice guy scanner doesn't understand his powers, hones his abilities, and eventually enters into a scanning war with an evil scanner. Some details are changed here and there, such as the police chief who wants to use scanners to accomplish a radical new shift in local government, and the long lost sister of the nice guy scanner that enables the hero to "possess" a target as opposed to scan him to death.
Scanners 2, like the original, has a reputation for being terribly gory. In reality, there are only two scenes of true gore, (an exploding head, and a spurting tumor on the back of a criminal's neck) but plenty of people flung against walls from unseen mental forces. A few folks end up with deformed faces, but no blood. The final climactic battle is very toned down, and results only in a burned-out corpse shown briefly.
The plot does have some references to the protagonists from the original film, but it is not necessary to see the first movie before seeing this one.
