Guess Who's Back! And he's asking "Did you miss me?"

The ending of Sherlock Season 3 finale episode "His Last Vow" marks the return of Sherlock's arch enemy Jim Moriarty who initially believed to commit suicide on season 2, took control every screen in England with an annoying GIF message that keeps repeating over and over. If you didn't see it, here's a video of his return.

Fans went on a frenzy and disbelief, but the question remains, was that really Moriarty? Will he show up in Season 4?

While we don't yet know when 'Sherlock' season 4 will film or premiere, given its cast and crew's increasingly busy schedule, showrunner Steven Moffat assures viewers that the twist of Moriarty's return will have heavy implications for future seasons, and wasn't devise for a cheap shock.

TVGuide had a chat with Moffat about his plans surrounding Moriarty's return next season. He told TVGuide that;

"We always knew what we were going to do with Moriarty. This has been the game plan since the end of Series 1 when we realized we had a crack on our hands with Andrew [Scott]. This is something that the whole series has been building to. I won't say what it is we're doing, but we have plans. And I'm pretty bloody certain those plans will please people...

We had a whole set of specific story ideas mostly for Series 4 but reaching into Series 5, which is because Mark [Gattis] and I happened to be chatting one day and as occasionally happens, we just ducked out of the rain and into the accountant's office. We found ourselves getting very animated about a set of ideas we could have. I think they're the best set of ideas we've ever had for Sherlock. So I'm very excited about that."

Will his comeback in the show make Sherlock and Watson's lives a living hell? We'll find out more updates once filming of season 4 starts.