Season 1 of Penny Dreadful premiered on May 11, 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.

Season 2 of Penny Dreadful premiered on May 3, 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.

Season 3 of Penny Dreadful premiered on May 1, 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.