Outlander is intent on keeping fans on their toes, right down to the final moments of season 2.

The Starz series entered its first season with a built in fanbase. Diana Gabaldon's novels have captivated readers for over a quarter of a century, and those who have spent the long night hours turning the pages were eager to see Claire (Caitriona Balfe) and Jamie (Sam Heughan) take the screen. Although not all these fans have embraced Outlander's numerous changes, others will be delighted to learn that the season 2 finale will continue to surprise.

Prepare to see a shockingly familiar face during "Dragonfly in Amber."

The finale will pick up in 1968, 20 years after Claire first returned through the stones to be with Frank (Tobias Menzies)... and this mystery character will have a key part in helping Claire reconcile what happened centuries earlier during the Battle of Culloden," TV Guide teased.

Who is the site referring to? Readers and newbies alike already know that the adult versions of Roger Wakefield and Brianna Fraser will make their debuts in Saturday's episode, and there is always a chance that Claire's return to Scotland could reunite her with a character readers believe deceased.

According to showrunner Ron Moore, fans should never assume Gabaldon's timeline is set in stone.

"Fans are looking forward to certain things, and you want to satisfy that, and at the same time you want to surprise them, you want to catch them off guard, you want to scare them, like 'Oh my God, Frank's going up the hill! If he goes through time, I'm quitting watching the show!'" Moore teased, according to Three If By Space. "People across America are losing their minds. That's fantastic. I enjoy that."

Find out more when Outlander airs its 90-minute finale Saturday at 10 p.m. ET on Starz. Click the video below to see a preview for "Dragonfly in Amber."

Tags: Outlander television Starz