While Monday’s episode of Supergirl may be a bottle episode in every sense of the word, that doesn’t mean that it looks any less thrilling. In fact, it looks to be one of the most nail-biting, edge-of-your-seat episodes of the season. ‘The Martian Chronicles’ will find Kara (Melissa Benoist), Alex (Chyler Leigh), Winn (Jeremy Jordan), J’onn (David Harewood), and M’gann (Sharon Leal) trapped in the DEO when a White Martian named Armek comes to Earth looking for M’gann. Because of martians’ ability to shapeshift, the intruder could be anyone and every member of the team will have to quickly decide who they can trust.

The photo gallery is fairly small but does give us a good sense of the urgency and gravity of the situation.

The new sneak peek that was released today, however, doesn’t take place in the DEO so it’s most likely one of the first few scenes of the episode. We find out that J’onn has been following M’gann to make sure that she’s safe…but her safety doesn’t last long.

Arrowverse Crossover: "Crisis on Earth X"

‘The Martian Chronicles’ airs on February 6th at 8/7c on The CW.