The Death Merchant
S01E25 - Airdate: 1967-03-03
Runtime: 60 min
Ending up on different sides just prior to the Battle of Gettysburg, Doug and Tony must stop an attempt by Machiavelli (who had traveled in time from the Renaissance due to the Time Tunnel Project) from trying to affect the outcome of the battle and send him back into time.
Episode details and rating from TVmaze.