Showtime has released a haunting new trailer for its hit drama series Penny Dreadful, ahead of the much-anticipated third season premiere on Sunday, May 1 at 10 PM ET/PT. Starring Josh Hartnett, Timothy Dalton and Eva Green, Penny Dreadful is a frightening psychological thriller created, written and executive produced by three-time Oscar nominee John Logan (Hugo, The Aviator, Gladiator). This trailer features a new look at Josh Hartnett's Ethan Chandler, who seems to be embracing his identity as a werewolf.

This season on Penny Dreadful, Tony Award-winning star Patti LuPone (American Horror Story), who guest starred last season as the Cut-Wife, returns as a series regular in the new role of Dr. Seward, an American therapist who treats Vanessa (Eva Green) with an unconventional new approach. Wes Studi (Hell on Wheels) joins as a series regular playing Kaetenay, an intense, enigmatic Native American with a deep connection to Ethan (Josh Hartnett) who also becomes an ally to Sir Malcolm (Timothy Dalton).

The third season, which premieres with The Day Tennyson Died on May 1, also adds Robert Louis Stevenson's Dr. Henry Jekyll (Shazad Latif). Other guest stars include Screen Actors Guild Award nominee Christian Camargo (Dexter, The Hurt Locker) as Dr. Alexander Sweet, a zoologist who strikes up an unlikely friendship with Vanessa; Sam Barnett (2012, Jupiter Ascending) as Dr. Seward's mysterious young secretary; Jessica Barden (The Outcast, Far from the Madding Crowd) as Justine, a young acolyte to Lily (Billie Piper) and Dorian Gray (Reeve Carney); and Perdita Weeks (The Tudors), as Catriona Hartdegan, a scholar with expert knowledge of the supernatural. Simon Russell Beale returns as Dr. Ferdinand Lyle and Sarah Greene as Hecate. Rory Kinnear (as The Creature) and Harry Treadaway (as Dr. Frankenstein) also star.

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Penny Dreadful is created, written and executive produced by John Logan for Desert Wolf Productions, along with Oscar winner Sam Mendes (American Beauty, Skyfall) and Pippa Harris (Revolutionary Road, Call the Midwife), both of Neal Street Productions and Karen Richards (The Borgias). Penny Dreadful is a co-production with Showtime and Sky. For more information about Penny Dreadful, go to: SHO.com, follow on Twitter, Instagram and Facebook, and join the conversation using #PennyDreadful.

With just a few weeks left until Penny Dreadful returns on Showtime, stay tuned for more footage and photos form this highly-anticipated season. Do you have any theories about what will happen on Penny Dreadful this season after taking a look at the latest trailer? Chime in with your thoughts below, and stay tuned for more as we get closer to the May 1 premiere date.