The stage is set for the progress of the series as Tony and Doug are now " switched " from one period in history to another , allowing episodes to be set in the past and future . Episodes 2-23 begin with the following narration ( voiced by Dick Tufeld ) : Tony and Doug become participants in past events such as the sinking of the '' Titanic '' , the attack on Pearl Harbor , the eruption of Krakatoa , Custer 's Last Stand , and the Battle of the Alamo among others . General Kirk , Ray , and Ann in the control room are able to locate them in time and space , observe them , communicate with them through voice contact , and send help . When the series was abruptly cancelled in the summer of 1967 by ABC , they had not filmed an episode in which Tony and Doug are safely returned to the Time Tunnel complex
eruption of Krakatoa
1883 eruption of Krakatoa
The Time Tunnel