Release Message:  Janeway and Paris (Robert Duncan McNeill) are sent back in time before a planet experienced a horrific catastrophe and are faced with the decision of whether to try to stop it.

Description:  The Voyager crew discovers a planet which recently suffered a horrific catastrophe. Upon investigation, Janeway and Paris are sent back in time before the disaster and are faced with the decision of whether to try to stop it. Wikipedia: Captain Kathryn Janeway goes back in time one day before an alien city is annihilated.