When does Penny Dreadful return?

Penny Dreadful is a horror drama television series. It premiered at the South by Southwest film festival on March 9 and began airing on April 28, 2014. The title refers to the penny dreadfuls, a type of 19th-century British fiction publication with lurid and sensational subject matter. The show was originally pitched to several US and UK channels, and eventually landed with Showtime, with Sky Atlantic as co-producer. After the third-season finale on June 19, 2016, series creator John Logan announced that the main story had ended.