Doctor Who: 15 Cool Details Peter Harness Just Revealed About The Zygon Invasion
4. These Alternate Titles Were Briefly Considered
The Zygon Invasion and The Zygon Inversion are both succinct and fitting episode titles, but unsurprisingly, they weren't the only ones that were in the mix.
Other possible candidates were "The World of the Enemy" for the first episode, and "Truth or Consequences" - a name of the town featured in the episodes, as well as the moniker used by the Zygon rebel group - for the second.
Harness didn't say how far these alternate titles got, but it's not unusual for TV episodes and even movies to switch titles late in the game.