Fans of Star Wars: The Clone Wars were surely amazed to see the former Sith Lord known as Darth Maul make an appearance in Solo: A Star Wars Story. To make that happen, however, two people had to be brought in to make sure that Maul's character was consistent.
In an interview with Star Wars Holocron, Sam Witwer, who voiced Maul in The Clone Wars and Star Wars Rebels, spoke about how he and Clone Wars creator Dave Filoni shaped Maul's cameo.
"There was a reshoot that had to happen because people like me and Dave Filoni were letting them know there were a lot of details that weren’t consistent," Witwer said. "That’s not me saying these people didn’t know what they were doing because they were making a movie and doing it at lightspeed."
Witwer knew that his familiarity with the character had a lot of value: "Ultimately, they did the right thing because they hired the people who were the experts on this like Dave Filoni and, I dare say, me, because I’m kind of an expert on what we’ve been doing with Maul for the past decade, y’know?"
Maul appears in hologram form to Qi'ra (Emilia Clarke) during the final act of Solo; he had become head of the Crimson Dawn crime syndicate at that point, and ordered her to find who killed Dryden Vos (Paul Bettany).