Sherlock @ Comic-Con: Season 4 Trailer Teases Moriarty's Return

Sherlock fans, you’re about to get rewarded for your patience.

Though Season 4 of the PBS drama won’t debut until 2017, a scintillating sneak peek was unspooled during Sherlock‘s panel at San Diego Comic-Con on Sunday.

COMIC-CON 2016 Exclusive Videos, Casting News, Scoop and More

In the teaser trailer above — which was met with quite a few gasps from the fans in Hall H — the titular sleuth’s exile from the United Kingdom is put on hold so he can once again face off against nemesis Moriarty. The only problem? Holmes has no idea how to stop his foe from wreaking utter havoc.

The sneak peek also gives us a glimpse at Toby Jones’ new villain; dude’s got the maniacal laugh down pat.

And if the teaser trailer weren’t intense enough, star Benedict Cumberbatch assured fans that the three upcoming installments are some of the series’ most gripping.

“The ones we’re doing now are so ambitious,” he hinted. “It’s an emotional roller coaster, this [season]. There’s a huge learning curve.”

Press PLAY above for a brief glimpse at Sherlock‘s next go-round, then hit the comments with your thoughts!