Once Upon a Time bosses: Those new guys aren't Brothers Grimm

Some new faces are coming to Storybrooke in the Once Upon a Time season finale.

Back in March, news broke that Sam Witwer and Hank Harris had been cast as the evil warden of a mental institution and a meek patient he torments, respectively. Their descriptions seemed to match early reports of two brothers appearing in the finale, leading to speculation that they could actually be the Brothers Grimm. Henry’s role as the Author factoring into the finale only gives that theory even more weight.

However, EW can confirm that Battlestar Galactica‘s Witwer and The Man in the High Castle‘s Harris will not be taking up that mantle. “I can say that definitely it’s not the Brothers Grimm,” executive producer Edward Kitsis says.

But who they are portraying will play into the season ender. “What’s fun about those two characters is very similar to season 1, when we didn’t know who Graham was, and we were guessing sometimes what character they are,” Kitsis says. “The finale will work much like that, in that the question of who these two are will be part of what the story is.”

“Sam and Hank play characters who play a pivotal role in the season finale,” EP Adam Horowitz adds. “Where they’re from, who they are, and what they’re doing does tee up an element of what we’re doing for season 6. It’s more like opening a door, rather than introducing the whole of what season 6 will be. Hopefully we’re giving you a little taste of what’s to come.”

Once Upon a Time airs Sundays at 8 p.m. ET on ABC.