En caso de que el viajero cambie la historia, regresemos al futuro.

Questions & Answers about En caso de que el viajero cambie la historia, regresemos al futuro.

Why is cambie in the subjunctive here instead of the indicative?
The phrase en caso de que (in case) is a contingency trigger. It always requires the subjunctive because it sets up a hypothetical situation that may or may not happen. Since the traveler hasn't actually changed history yet, we use the present subjunctive cambie.
Why does the sentence use regresemos? Is that also triggered by en caso de que?
No, regresemos is the main action of the sentence, so it isn't controlled by en caso de que. It is the affirmative nosotros (we) command, which translates to "let's return." In Spanish, nosotros commands just happen to use the exact same spelling as the present subjunctive.
Can historia mean both "story" and "history" in Spanish?
Yes, historia is used for both words. You have to rely entirely on context to know which one is meant. Given the time-travel theme of returning to the future (al futuro), "history" makes the most sense in this sentence.
Is it possible to just say en caso que and drop the de?
You might occasionally hear native speakers drop the de in fast, casual speech. However, this is considered a grammatical error. The strictly correct phrase is always en caso de que, and that is what you should practice using.

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