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The Internet Time Travel Database

Of All Possible Worlds

by William Tenn

Max Alben Mac Albin is genetically predisposed to survive time travel, so he’s the natural choice to go back in time and shift the course of a missile that shifted the course of history.
— Michael Main
Now! Now to make a halfway decent world! Max Alben pulled the little red switch toward him.
flick!
Now! Now to make a halfway interesting world! Mac Albin pulled the little red switch toward him.
flick!
DEBUT
“Of All Possible Worlds,” Galaxy Science Fiction, December 1956.
VARIANTS
2 English variants
TRANSLATIONS
Translations to French, German
TAGS(SPOILERS!)
Time Periods Timeline Models
  • Fragile Timeline: “Maybe the problems will be tough enough so that they’ll get the same idea we did and try to go back to the same point in time to change them.”
Time Travel Methods
  • Time Habitats: The machine has an entrance, and the traveler can walk around in it. Seemed like a medium-sized room.
Themes
  • Causal Loops: A multi-timeline causal loop
  • Differing Time Rates: “He materialized the time machine around the green instrument panel, sweating a bit at the sight of the roomful of military figures, despite the technicians’ reassurances that all this would be happening too fast to be visible.”
  • Fix History!: “You will be in a superb position, a superb position, to deflect the missile in its downward course and alter human history for the better.”
  • Making Things Worse: “He materialized the time machine around the green instrument panel, sweating a bit at the sight of the roomful of military figures, despite the technicians’ reassurances that all this would be happening too fast to be visible.”
  • Multi-Timeline Causal Loops: A strong example of a multi-timeline causal loop, that could have been stronger had we learned what happened to each traveler (Max and Mac) after then changed their rocket’s course.
  • Time Travel Sickness, Injuries, and Mixed-Up Body Parts: “. . . extra-temporal blackout.”
Groupings
TIME TRAVEL ITINERARY (SPOILERS!)
  1. From a plague-ridden world, 2089 ⋙ to a rocket remote-control station, 18 April 1976. Multiple trips. Note: Max Alben.
  2. From a nearly sterile world, 2089 ⋙ to a rocket remote-control station, 18 April 1976. Multiple trips. Note: Mac Albin.