It seems that Redditors are just bursting with fan theories leading up to the release of Star Wars: The Rise of Skywalker. A recent post that's getting attention on the internet comes from user overthecause, who argues that the Emperor Palpatine we're expected to see in the upcoming film has already made his appearance in the current trilogy, disguised as Snoke.
As reported by The Independent, the theory gets backed up by the idea that, "Emperor Palpatine could have moved his consciousness into another body using the dark side’s Sith Force, known in the series as Essence Transfer." This would explain how Snoke knew so much about the Old Republic and Darth Vader.
The Independent points out that both Palpatine and Snoke's deaths were because of cases of "overconfidence" which clouded their judgements. Darth Vader killed Palpatine in Return of the Jedi because of his blindness, just as Snoke was unable to see Kylo Ren's betrayal in The Last Jedi.
The Reditor also explains how the final scenes for Snoke and Palpatine both include the same track, which they refer to as "Palpatine's theme." Could it be meant as a hint that the two are connected?
We still have a few months to speculate. The Rise of Skywalker will hit theaters Dec. 20.