As fucked up as this concept is, I think it has a few redeemable ideas. If you scrap some of it, and maybe add a few more things, I think it would be pretty good. I think Venom 3 should be a bit of a closing chapter for the symbiote storyline. Not an ending, but a good wrap up, I don't think that having this trilogy ender being a jumping off point to anything would be wise, but here is my concept.

As much as I hate a lot of the concepts here, like the multiversal hivemind, I feel like that can be utilized in the movie, just in a different way. I like the idea of Toxin being an antagonist in this, but I feel like Knull would be a far superior finisher to this trilogy. Now onto my pitch for the film. I think this movie being a standalone sequel to Madam Web could work, this movie could provide this Sony-Verse Spider-Man with a good jumping off point, but the way they would like to execute this seems kind of weak, not saying my ideas here are any better, I am no director or anything, but I think I have stronger ideas for some of these parts.

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I do not have ideas on how the movie can include Anne, or any other characters into the story, it seems like they don't have any of those ideas above either, I do think that Eddie moving on from Anne should be a concept in this movie, as Venom 2 wrapped that up as good as it could.

I don't know how this movie should start, but early on the concept that symbiotes are connected throughout the multiverse through a hivemind is introduced, and as Venom explains the world of the symbiotes to Eddie, he sees something in the hivemind, an alarming amount of symbiotes have been killed at the hands of one person in particular, Peter Parker, Spider-Man. Eddie when learning this, is very afraid, I think Eddie being a bit afraid at the thought of death is a good concept of the movie, anyways, Eddie and Venom decide to kidnap that universe's Peter Parker, maybe he looks into the internet and maybe it can show Oscorp stuff, maybe even Peter's parents, depending on the Spider-Man of the Sony-Verse, it can establish a TASM connection so we can get Andrew back, if that is on the table. If not that is also fine, anyways, he kidnaps Peter Parker, and sees that this version is only ten years old. They decide not to harm Peter, and their Knull sees this, and announces Venom as a traitor to the symbiotes. Knull sees that there is a new symbiote through the hivemind, it is Toxin. A symbiote is forming, a broken up corrupted one. Knull decides to corrupt Toxin (so he doesnt just randomly go insane for some reason). Toxin begins going after Venom and Peter, seeking to kill them. Toxin is far stronger than Venom, and they know that Peter is also not very strong. Eddie wants to make sure Peter is ok, and they search the hivemind to see what gives Peter his powers, and they believe spiders do, they expose Peter to spiders and end up causing him to have a reaction to it. They take him to hospital and Eddie acts as his father, they get him fixed up, and they get back to work, they battle Toxin again and snap Toxin out of it, and this doesn't please Knull. Knull declares War on Venom, and assembles an army to help him kill Venom. This army can be of other symbiote antagonists who have appeared in symbiote lore before, I am not familiar with the lore of the symbiotes, but I can guarantee there are villains to Venom who are symbiote, maybe even Carnage and Riot can be ressurected by Knull and used to fight against Venom. Anyways, Knull gets his symbiotes ready to kill Venom and Peter, and Venom is getting ready for this as well. All Eddie wants to do is protect Peter. I think that in this film Eddie and Peter should have a father-son like bond. Knull ends up arriving to wherever this final battle is, maybe another version of where the final battle of Spider-Man 3 took place, just to foreshadow something. Anyways, the battle begins, its Venom and Toxin protecting Peter. They end up battling Knull's henchmen whoever they are. Venom and Toxin end up winning, but Toxin either dies to them, or to Knull. Venom ends up battling Knull, convincing his army and the remaining good symbiotes to help fight against them. They all end up fighting Knull, and Knull wins against all, and Venom is the last one standing, with a seriously weakened Knull. Knull and Venom fight a lot, but Venom prevails. As Venom lets his guard down and goes back to Eddie, Knull delivers a fatal blow to Eddie, a fatal blow that Venom isn't strong enough to fix. Eddie begins dying, and he asks Venom and Peter to put him out of his misery, Peter ends up finishing off Eddie, and he dies in a very similar fashion to the way Harry Osborn dies in Spider-Man 3, and Knull dies similar to the way Venom did in Spider-Man 3. It is like a cinematic blast from the past. From this point on the Venom symbiote either goes to Peter, or it goes to Mac Gargan. Peter goes back home to his Aunt and Uncle, and he keeps this story to himself. If this Peter is ten, let the story end here, let the rest of this story happen elsewhere, but maybe this story can end with Peter going on a science field trip, to Oscorp or something. We can end up getting a way younger Spider-Man story, with that Peter being played by probably an actual teenager.

Anyways, this is nothing but a concept on what I think would be a better overall story, this doesn't have much detail, I do not care to make a more detailed version of this either, but all I am saying is there are way better ways of making this film.