Will Jim Moriarty Return?

However, Jim Moriarty did return to Sherlock Season 4 in the form of a flashback that proved to be very important to the overall storyline. Despite all of Mycroft's constant bragging about being the smartest Holmes brother, he definitely made a big mistake when it came to his sister, Eurus.

Does Jim Moriarty come back?

While "The Final Problem" was all about Sherlock's sister Eurus, and the island of Sherrinford on which she'd been imprisoned since childhood, fan favorite Moriarty came back in Sherlock Season 4 to terrorize Sherlock and Watson too. The Sherlock finale may have featured him, but Moriarty is definitely still dead.

Is Moriarty in Season 3 of Sherlock?

One of the barriers to Moriarty's involvement in this new season is that he's...well, he's dead. In the Season 3 premiere "The Empty Hearse," the audience is taken back to the roof of St. Bart's, where Sherlock Holmes fakes his suicide. ... Scott isn't out of a job just because Moriarty is deceased.