Waverly is kidnapped by a group of Revenants, but Wynonna uses Peacemaker to rescue Waverly and send the Revenants back to Hell. Doc Holliday climbs out of his prison after Wynonna unknowingly saves him, and introduces himself to her as Henry. Wynonna is recruited by Black Badge Agent Xavier Dolls to use Wyatt's gun 'Peacemaker' to send the Revenants of his kills back to Hell. The older sister Willa was destined to inherit Wyatt's abilities and gun but after she is kidnapped, Wynonna becomes the heir. Waverly reminds Wynonna (who was institutionalized as a child for insisting demons exist) of the family curse which she has been researching: Wyatt Earp killed 77 outlaws with his gun now those outlaws are resurrecting as Revenants and they are coming for the Earps. Despite her Aunt Gus' warning, Wynonna investigates her uncle's death and is reunited with her younger sister, Waverly in the process. Her trip home begins with a missing passenger and a scream in the night. Wyatt Earp's great-great-granddaughter, Wynonna Earp, returns to Purgatory to attend her uncle's funeral. The titles of episodes are based on country and western songs. Total episode running time is 43 minutes (including opening title sequence and closing credits roll). It premiered in Australia on Spike on February 5, 2017. In the United Kingdom, Wynonna Earp premiered on Spike on July 29, 2016.

Season 4 premiered on Syfy and CTV Sci-Fi Channel on Jat 10 p.m. In September 2019, Space became the CTV Sci-Fi Channel. On July 21, 2018, Syfy and Space announced the renewal for a fourth season. Season 3 premiered on Syfy and Space on July 20, 2018, with the broadcast time changed to 9 p.m. Wynonna Earp was renewed for a third season by Space and Syfy on July 22, 2017.

Season 2 premiered simultaneously on Syfy and Space on June 9, 2017, at 10 p.m. In March 2017, Bell Media announced the new partnership between Space and SEVEN24 Films as Canadian co-producers of Wynonna Earp, with the series moving from CHCH to Space. It was renewed for a second season on July 23, 2016. The series premiered in the United States on Syfy on Apat 10 p.m., and on CHCH-DT in Canada on Apat 9 p.m. The series follows Wynonna Earp, the great-great-granddaughter of legendary lawman Wyatt Earp, and is based on the comic book series by Beau Smith. Wynonna Earp is a Canadian-American supernatural Western horror television series developed by Emily Andras that airs on Syfy and CTV Sci-Fi Channel (formerly known as Space).

Wynonna earp season 1 cast