It is possible that Darth Plagueis the Sith was in The Acolyte trailer. But instead of him , other candidates could also be the antagonists involved in the show.

Who is Darth Plagueis? Well, as a refresher, let’s hear it straight from Palpatine himself in the prequels, as he explains it to Anakin: "Did you ever hear the tragedy of Darth Plagueis The Wise?

In fact, Anakin was still using this lightsaber when he first turned ... Palpatine already mentioned that his own master, Darth Plagueis, had developed a means of overcoming death through the ...