Five Nights at Freddy's franchise creator Scott Cawthon has released a dark new trailer of the newest entry in the popular survival horror series subtitled Sister Location. Focusing on new evil animatronics, the spin-off's mysterious trailer takes players "deep below ground" using a strange elevator and shows off clips from previous games in the series.

The teaser of the upcoming horror game reads: "Deep below ground. Where memories sleep. Anger is restless. And secrets don't keep."

Released on 21 May, the trailer has already garnered more than 2.2 million views and counting.

Although the video does not reveal much in terms of gameplay, it does show snippets from previous games in the series. It also shows the player crawling through vents to move from room to room, which could imply some sort of free roaming and additional exploration in the game.

The minute-and-a-half-long footage also shows off a cast of four terrifying animatronics including Freddy Fazbear, Mangle, a clown-like ballerina and a new super-creepy, pig-tailed robotic clown that many YouTube users have referred to as "Baby."

The video concludes by promising a fall release date accompanied by a creepy voice saying, "You don't know what we've been through."

The original Five Nights at Freddy's games take place in "Freddy Fazbear's Pizza" restaurant where evil animatronic villains come to life at night. Players are tasked with surviving the night shift as a security guard by using a security camera to track the terrifying animal robots' movements.

Since August 2014, the indie point-and-click horror series has released four titles for Windows PC and mobile platforms. In January, a PC role-playing game based on the series Five Nights at Freddy's World was released to poor reception due to missing features. Cawthon later admitted that the game's release was rushed and left out multiple baseline features.

"There are a lot of features that this game should have had before release, features that I was told about, but ignored and didn't implement," he said. "Features such as being able to see what abilities do during battle, or being able to see a stats page for your characters. These are features that any good RPG would have."

The developer also pulled the title from Steam a week after its launch promising to polish its features.

According to the trailer, Five Nights at Freddy's: Sister Location is slated for release this fall.