To improve his performance as the ship's physician, The Doctor undertakes a personality enhancement project on the Holodeck, incorporating several accomplished historical figures' traits and temperaments into his Starfleet database. But he also adopts several aberrant character traits from those non-fictional figures and is soon over taken by a dangerous, cruel Mister Hyde-like personality.
Starring Kate Mulgrew as Captain Janeway, Robert Beltran as Chakotay, Roxann Biggs-Dawson as B'Elanna Torres, Jennifer Lien as Kes, Robert Duncan McNeill as Lt. Tom Paris, Ethan Phillips as Neelix, Robert Picardo as The Doctor, Tim Russ as Tuvok, Garrett Wang as Harry Kim.
Guest starring are Lee Smith as Zahir, Stephen Davies as Nakahn, Noel de Souza as Ghandi, Christopher Clarke as Lord Byron, Sue Henley as the Ensign.
The story was written by Alex Singer and directed by Alex Singer.