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What are the Chitters? It’s unclear, but all we know is that the Winchesters will soon be fighting these creatures when SUPERNATURAL returns from a two-week hiatus.

We’ve seen Sam and Dean take on some pretty interesting — and weird — monsters over the last 11 years, but this looks like something new even for them. In a small town in Colorado, mysterious disappearances are happening every 27 years. Sam and Dean head to the town to investigate. Someone suspects it’s aliens, but Sam believes they’re dealing with some sort of mutant creature with green eyes. During the investigation, the Winchesters meet two hunters who actually have a personal vendetta against these these once-in-a-generation monsters.

Browse through photos above for an all new episode of SUPERNATURAL airing s on April 27 at 9:00 p.m. ET/PT on The CW.