The American post-apocalyptic TV series "Z Nation" returns this week with the show's sixth episode of its seventh season. In the upcoming episode, Doc (Russell Hodgkinson) delivers a speech at the funeral of Lucy (Tara Holt), and the team faces a group of dangerous clowns.

In the preview video, the team is gathered at Lucy's funeral with Murphy (Keith Allan) opening the clip with a brief speech saying he is sorry while sobbing. Doc follows it up with his own words saying they all love Lucy, and from the moment she was born, they knew she was special. He added that Lucy was their bright spot in their world of darkness.

Doc ends his speech by saying that in her short life, she almost saved the world, and quotes another doctor saying, "Let's not cry because she is gone, but let us smile because she was here." After saying their goodbyes, 10K (Nat Zang) then proceeds to throw a torch at Lucy's resting place igniting a fire. Shortly after they leave the scene, zombies start to approach her grave.

Meanwhile, the promo for the upcoming episode titled "Warren's Wedding" features a lot of clowns who call themselves "The Zuggalows." They appear to put the team in danger with one of them seen pointing a gun at Murphy's head, even placing him on a rotating target and throwing knives at him. He is also seen strapped on some sort of device and being electrocuted. Doc also appears in the promo, shooting what he thought was a real gun at a clown, and, after realizing it was only a toy, he exclaims "Clazy-ass clowns!"

Who are these clowns and how did they end up meeting Doc and the rest of the gang? What do they want? 

"Z Nation" season 4 episode 7 will air on Friday, Nov. 10, at 9 p.m. EST on SyFy.