One of the most dangerous aspects of Venom is that he doesn't set off Spider-Man's spider-sense. The explanation for this was always that it had once been his costume and being in proximity to him, his warnings did not register the symbiote as a threat.

But when Spidey first gets the symbiote, it does set off his spider-sense as seen here:

Symbiote triggers the spider-sense

What the heck is that--? And why is it making my spider-sense tingle?

So what happened?

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    Off the top of my head, I would suspect that reason the symbiote doesn't set off Peter's spider-sense has something to do with their previous fusion. When he first discovered the symbiote, they weren't linked yet. – TenthJustice Jan 12 '17 at 12:53
  • Certainly a point- I don't know if he ever refers to it afterwards or anything. If not, I will certainly accept a "it's never really discussed" as an answer. – Broklynite Jan 12 '17 at 12:58
  • I can't find an exact source to reference, but the explanation I recall is that the symbiote merged Peter's DNA into its own, so Peter's Spider-Sense doesn't register danger from "Peter". – phantom42 Jan 12 '17 at 13:56

Even Marvel doesn't quite seem to know.

Marvel.com sort of handwaved the explanation in a previous version of their bio for Brock:

Marvel's old bio for Brock

Brock taunted Peter Parker with minor assaults, such as pushing him in front of a moving subway train. The alien costume could cancel out the wall-crawler’s spider-sense presumably by projecting conflicting frequencies upon Spider-Man's brain waves.

The generally accepted answer you'll find discussed is that the symbiote takes on DNA or abilities of its hosts. Peter's Spider-Sense does not register non-threats, and the Symbiote exploits this by somehow (see the "presumably" even in the Marvel.com description) confusing Peter's senses by appearing to be a non-threat or even Peter himself.

  • The quote doesn't appear to come from Marvel.com, it appears to come from the fan-wiki; marvel.wikia.com/wiki/Edward_Brock_(Earth-616) – Valorum Oct 2 '18 at 20:00
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    It came from Marvel.com at the time of posting, as you can see in the wayback machine. – phantom42 Oct 2 '18 at 20:08
  • @phantom42 Can you edit that into your answer? – Thunderforge Oct 2 '18 at 20:10
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    You might want to make it clearer in the answer that at this point the marvel.com site was a fan-written wiki, albeit one that had regular participation from the Marvel production team – Valorum Oct 2 '18 at 20:10
  • As a note, I love the notion that Pete's spider sense detects the symbiote as himself. "Hmm... something's being awfully noisy in that kitchen over there, but my spider sense says it's just me raiding the fridge. ...I'll ignore it." – Justin Time - Reinstate Monica Aug 4 '19 at 21:20

Spider-sense doesn't affect clones of Peter Parker or people he trusts (not exactly scientific). Here's some semblance to an explanation but I think it's because it adds suspense to the story.


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