The 100 season 3 returns with a horror themed episode, where Raven Reyes, Clarke Griffin, Bellamy Blake, Octavia and others return to Arkadia to save the Sky people, but there is something scary waiting for them at the camp.

Episode 12 is titled, Demons, which will air this Thursday, 21 April at 8pm EST on The CW. The official synopsis reads as follows:

Click here to watch the episode online on The CW website (only in the US).

In the previous episode, Raven survived the dangerous exorcism of Clarke and Bellamy, and the gang learned that Alie wanted Raven dead because she knew that the second AI was the only thing that can destroy her. The episode ended with the original 100 team reunited to save the Sky Crew from Alie's plans.

The promo opens with the original 100 team arriving in Arkadia, to a practically vacate camp, as Octavia says, "It's like a ghost town!" They check inside the camp, and find that everyone is missing. Clarke adds, "It's like they just got up and walked away." But like a horror movie scene, the team senses that someone is inside the camp, trying to kill them.

The promo says, "They are not alone" as we see some angry looking Grounders striking Raven, as Clarke yells, "run." The rest of the promo is all about the scary-looking Grounders hunting down the team members one by one.

Will Clarke and Bellamy get out alive? Fans will learn more about their fate in The 100 season 3's upcoming episode.