Warning: Spoilers ahead for Ghosts season 4 finale.

Sass’s girlfriend Joan in Ghosts season 5.

With Ghosts already renewed for seasons 5 and 6, the show must be thinking about how to stay fresh with its premise-based limitations. The show has avoided using its ultimate stakes - sucking off one of the ghosts - which is for the best, as the ensemble nature of Ghosts is one of its greatest charms. Ghosts instead tends to add rather than subtract elements. The Ghosts season 4 finale teased a brilliant idea I hope the show runs with in future seasons: introducing more types of supernatural creatures to the series.

Ghosts Season 4 Finale Definitely Floated The Idea That Vampires Might Exist In The World

Trevor’s Quip Lays The Groundwork To Introduce Vampires To A World That Already Has Spirits

Patience making the walls bleed in Ghosts

Sam and Isaac are finally getting ready to publish their book. They don’t have the sources to back up Isaac’s life story as a biography, but by making Isaac Higgintoot into the vampire Higgintooth, they are able to find a publisher. Patience the Puritan ghost is drawn to the book launch party by an evil presence, and she calls the very concept of a vampire “demonic.” Trevor quips that they are ghosts, so “don’t throw stones” - which could be a throwaway joke, but might lay legitimate groundwork to introduce other types of supernatural creatures to the world of Ghosts.

Ghosts & Their Powers In CBS' Ghosts
Ghost Name	Period/Occupation	Power
Pete Martino	Travel agent & Pinecone Troop leader	Can leave the property at will (but not indefinitely)
Trevor Lefkowitz	Stockbroker	Can move material objects with great effort
Sasappis	Lenape Native (1500s)	Entering Livings' dreams
Thorfinn	Viking	Harnessing electricity
Flower	Hippie	Makes Livings high if they through her
Henrietta "Hetty" Woodstone	Gilded Age socialite & Lady of the Manor	Be seen by all Livings on St. Patrick's Day
Alberta Haynes	Prohibition lounge singer	Project a humming/singing sound
Isaac Higgintoot	Revolutionary War captain	Gives off a foul smell if a living es through him

It would make sense that, because most humans can’t see or experience ghosts, there are other creatures lurking on the periphery of the world if Sam looks closely enough. Patience was actually sensing Elias Woodstone’s presence - not just the book launch - since he was attending the party as an emissary of the Devil. Patience’s hunch was right in general, but her intuition is not absolutely correct - she thought deviled eggs were literally eggs from the Devil, sprinkled not with paprika but the blood of the innocent.

Ghosts Routinely Adds To The Lore To Expand The World

Spirits Discover Their New Powers Every Season & They've Already Met A Poltergeist

Ghosts has slowly added to its lore over the years, so the introduction of an entirely new species would not be a huge leap. In Ghosts season 3, episode 7, the spirits meet a poltergeist, a type of ghost that attaches to a person instead of a location. That same season, Pete realized his ghost power of roaming after having been dead for decades, and in just one season, the show introduced Joan, another roamer, and Chris, a ghost completely uninhibited by boundaries while airborne.

Ghosts created its own lore for poltergeists, so they might put their own twist on other creature lore as well. Traditionally, poltergeists are corporeal spirits who can interact with the physical world. Peeves in the Harry Potter book series is one of the most notable examples of poltergeists in modern pop culture and, of course, the titular character of 1982's Poltergeist.

Ghosts walks a fine line between adding new lore while not over-explaining its fantasy elements, a balance every supernatural show must strike. What We Do in the Shadows is a perfect example of a show that had its focus on the core vampire clan, while introducing other creatures like werewolves for incredible comedic effect. If the ghosts can’t leave Woodstone Manor, Ghosts will bring other beings to them to keep the show feeling fresh and expansive.

How Other Creatures Could Be Used In Ghosts Season 5

Other Species Might Have An Insight Into How To Save Jay’s Soul

Ghosts is fairly locked into its setting, but other creatures would be able to come to Woodstone Manor. There is something uniquely funny about having vampires as guests at a B&B, since a major part of vampire lore is that they may only enter if invited. This could be an interesting twist for Jay, who feels left out in Ghosts, a complaint that is entirely justified – although he might come to miss the quiet.

It would make sense that if Pete and Joan were to meet other species on their travels, they would tell them about a hotel where the owners are primed to accept the supernatural. While it would be too much of a contrivance if these creatures were invisible to everyone but Sam, they may want to be somewhere where they don’t have to hide their identity quite as much.

While it would be fun to have another species just for the comedic possibilities, there is narrative potential for the Ghosts season 4 cliffhanger as well. Since some of these creatures might be undead, they might have insight into the afterlife and what it will take to save Jay from Elias Woodstone’s clutches in Ghosts season 5.

Enjoy ScreenRant's primetime coverage? Click below to sign up for my weekly Network TV newsletter (make sure to check "Network TV" in your preferences) and get the inside scoop from actors and showrunners on your favorite series.