Check this out.
http://www.firsttvdrama.com/funstuff/voyagen.html
'Gamble'WRITTEN BY : Jeri Taylor and Michael Piller.STORY BY : Marc Scott Zicree.DIRECTED BY : Cliff Bole.
When a malevolant crewmember gains Psi-onic Powers, Tuvok and Harry Kim must repair the Holodeck and escape the Vidiians.