I am a fan of Goosbumps, though I am not an adult neither am I in the film industry but, I want to add something of substance to the Goosebumps films. I feel a third could have potential. I want to hear from you what monsters should appear. Whether they are returning or they are new in appearance, it is all up to you! The sky is the limit.
I would love to see mask-mutant,beast-from-the-east,mister-wood,horrors and for maybe characters are Mary-ellen monster blood to replace the blob that ate everyone because eh it didn't feel like the original source material
R.L. Stine is still stuck in the book. It happens (somehow) that he is stuck in the HorrorLand series plotline. He meets all those kids, and they're following the exact plot in the book (along with him). We should get one of those moments where Stine tells them that they aren't real, merely characters in a book (they hadn't known that before). Some emotions here and there. Then they (also somehow) break away from their endless loop of following the storyline, and manage to escape with Stine. But (also also somehow) The Menace escapes as well.
We don't get that usual book sucking. Instead, Slappy actually buddies up with the others (just like in the books) and stop The Menace. Then some stuff happens.
Twist ending: Everyone finds out they were living in a book this whole time (you know, EVERYONE. Zach, Champ, Stine, Sonny, EVERYONE).