The X-Files is back in January, and in addition to returning stars David Duchovny and Gillian Anderson, there are some new faces on the show. Among other additions, we now know that Robbie Amell (The Flash) and Lauren Ambrose (Six Feet Under) are suiting up as FBI agents for at least one episode of the six-episode event series.

TV Line has the report, with these character details:

Robbie Amell will play smart and smooth Agent Miller

Lauren Ambrose will portray the equally sharp and confident XAgent Einstein.

There are varying accounts of how much we can expect to see of each actor, with some reports saying they may be regulars, and another saying they’ll be in one episode as a pair, and yet more claiming they’ll each be in an episode. In other words, they’re in the show, and that’s all we know. perhaps one of the mysteries tackled by Duchovny’s Fox Mulder character will be finding out precisely how many episodes these two are really in. Shouldn’t be too hard.

The revived series will also feature Mitch Pileggi as Walter Skinner and Joel McHale as a conservative internet news anchor in the new episodes. Reportedly, William B. Davis will return as the Cigarette-Smoking Man.

Here’s the most recent teaser for the new episodes. The X-Files returns to television on January 24, 2016.