But by invoking the show 'Journeyman' as a catalyst, we can change the history of Toobworld so that similar events now played out but with the established Presidents in the Oval Office. It's just that we'd only ever see the original events in reruns.
And as it turns out, there was more than one President serving "Tele-merica" in that original Timeline. Henry Talbot McNeil was the POTUS from 1969 into 1977, as established in about three episodes. But in "The Deadliest Game", a later episode of 'Voyage' once it began broadcasting in color, Robert F. Simon appeared as the President. We never learned his name, but just from the statutes of limitations imposed by Constitutional amendment, McNeil couldn't have been the President at that time. (As stated by Captain Crane near the beginning of the episode, it was July 14th, 1978.)
So the theory about some Time Traveler from 'Journeyman' going back in Time and altering History so that the Commander-in-Chiefs of 'Voyage To The Bottom Of The Sea' aligned with those of the real world and Toobworld still holds. It's just that the old timeline played out far longer than I first suspected.
"I think I understood some of those words,
Enough to know that you're completely potty."