Darth Maul’s survival was first revealed in Star Wars: The Clone Wars in the 2012 episode “Brothers,” where he reappears after the events of The Phantom Menace.

What happened

He was originally thought dead after being cut in half in The Phantom Menace , but The Clone Wars later showed he survived through sheer rage and the Dark Side.

Why it mattered

That reveal turned Maul from a one-film villain into a long-running character across later Star Wars stories, including Solo and Rebels.

TL;DR

The reveal happened in 2012 on The Clone Wars.