The following contains heavy spoilers for the season 3 finale of "Foundation," titled "The Darkness."

"Foundation" fans are no strangers to big adaptation choices. The Apple TV+ sci-fi epic frequently deviates from Isaac Asimov's seminal sci-fi series of books and short stories. There's a bigger emphasis on romance, big action spectacle worthy of a blockbuster movie, and even a planet-killing Death Star that puts at least one "Star Wars" film to shame . We've seen several core characters get entirely different portrayals, new characters rise up to become fan-favorites (Brother Dude, we salute you), and several other changes that give the show its own identity.

All this is to say, fans were trained to anticipate the TV version of the Mule storyline from the books could be differe

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