这是系列第三部，紧接上集Nightmare 2: Part 2
阿曼达·库尔特，又名“星波”（露西·韦斯特拉饰），多年来一直深受梦魇恶魔莫克洛克的困扰，她接受了专门的超级英雄创伤心理咨询，但似乎毫无效果。更糟糕的是，女英雄的治疗师（阿丽亚娜·罗格饰）似乎另有图谋。
接下来，星波踏上了一段充满危险与恐怖的史诗之旅。莫克洛克（卢-勒德饰）关于他众多兄弟姐妹的威胁变成了可怕的现实，星波也因此坠入了被调教凌辱的梦魇的深渊，在现实与虚幻的冲突中挣扎。加入星波的行列，看她如何逃离日益可怕的噩梦，能否保持理智，还是会从此改变……
Amanda Coulter, or "Starwave" (Lucy Westenra), has been reeling from her run in with the dream demon Mockylock for years, attending specialized Superhero trauma counseling that seems to be going nowhere. Worse, her therapist (Ariana Rogue) increasingly seems to have an agenda of her own.
What follows is an epic journey of peril and horror as Mockylock's (Lu-Lewd) threat about his many siblings is brought to terrible life, and Starwave tumbles down the rabbit hole in a conflict between what is real and what isn't. Join Starwave as she runs from her increasingly ruinous nightmares to see if she can survive with her sanity intact, or if she will come out the other side.... changed forever.