La temporada 1 de Penny Dreadful se estrenó el 11 de mayo de 2014.

Vanessa Ives wages a personal battle against an evil demon determined to possess her; Sir Malcolm Murray tries to save his daughter from a fate worse than death; Ethan Chandler becomes enmeshed with a group of London vampire hunters and falls for a doomed local prostitute, even as his own mysterious past threatens to catch up with him; Dr. Victor Frankenstein must face the consequences of his successful death-defying experiments; Dorian Gray falls for the unapproachable Vanessa Ives; Brona Croft confronts her imminent demise from consumption.

La temporada 2 de Penny Dreadful se estrenó el 3 de mayo de 2015.

Vanessa Ives and her allies find themselves locked in an epic battle against an unholy evil; Sir Malcolm falls under the spell of a bewitching temptress; Ethan's big secret becomes known as his past comes back to haunt him; Dr. Frankenstein's newest creation breaks hearts and then some; Dorian Gray falls for an unlikely woman.

La temporada 3 de Penny Dreadful se estrenó el 1 de mayo de 2016.

Confronting new horrors in dangerous new lands, Ethan Chandler, Dr. Frankenstein, Dorian Gray, Sir Malcolm, the Creature, and the ravishing but deadly Lily must each face -- and embrace -- their own most truly monstrous selves. But for Vanessa Ives, accepting her demons could exact a terrible cost and plunge the world into unending darkness.