Dave McNary Film ReporterScott Eastwood and Mel Gibson have joined the action-thriller “Dangerous,” along with Tyrese Gibson, Famke Janssen and Kevin Durand.Eastwood will portray a reformed sociopath who, after the death of his brother, heads to a remote island which soon falls under the siege of a deadly gang of mercenaries. Forced to fend for himself, he discovers their role in his brother’s demise and sets off on a relentless quest for vengeance.