'The Walking Dead' season 7 episode 15 spoilers: War against Negan begins; who showed up at Rosita's cell?

A promotional still for "The Walking Dead" | Facebook/TheWalkingDeadAMC

Rick (Andrew Lincoln) and Michonne (Danai Gurira) are all set to start the war against Negan (Jeffrey Dean Morgan) and the Saviors. Meanwhile, a mysterious person has appeared right before Rosita's (Christian Serratos) eyes.

On the next episode of "The Walking Dead" season 7, titled "Something they need," Rick and Michonne are more than ready to begin the war against The Saviors, to exact revenge and gain freedom from Negan.

As seen from the episode 15 promo, Michonne takes her position atop a tree to send out the signal while Rick and the rest of his army gather and prepare for war.

While Rick and the rest of the troops are gathering, it appears that Maggie (Lauren Cohan) will be left in a dangerous situation with the Hilltop's leader, Gregory (Xander Berkeley).

Gregory walks up to Maggie who is outside the walls, tending to the grass, while he talks about being open to a more harmonious relationship between her and her friends. But later on, Gregory is seen holding a blade behind Maggie's back. With Maggie's guard down, Gregory might get a good stab at her.

Meanwhile, Rosita is still locked up somewhere at the Sanctuary, and there are a lot of anticipation as to who the mysterious figure that showed up at her cell is.

According to Mic, this figure could be Dwight (Austin Amelio).

There are speculations that Dwight has grown rebellious of Negan over time, especially when his wife, Sherry (Christine Evangelista), left him.

Dwight meeting with Rosita could be an opportunity for him to form an alliance with others who want to bring Negan down. It is also predicted, based on the comic series, that Dwight will betray the Saviors, which the series might follow.

"The Walking Dead" season 7 airs every Sunday night at 9 p.m. EDT on AMC.