Come on!
Arch-enemies are always a different story. I didn't see Thanos take out Captain Marvel.
Besides, Reed Richards can take out everyone we've mentioned.
Not Thanos. As already mentioned, Marvel has officially listed Thanos as being smarter than Reed Richards.
Also.. the "fever dreams" stuff. That's the rude **** I'm talking about. Dial it the **** down, please. I'm beggin' ya.
Point is, if you have to turn Dr. Doom into Batman then you pretty much make my point that he's really no threat. Never have I seen Doom have anything of the sort set up, and if he did, he never really capitalized on it to great effect. After all, he must've known for years that he'd eventually face Thor one-on-one, so where were his plans in place for that eventuality? He had none. He just had his most recent plot to create a duplicate of the Destroyer which failed and nearly got him killed, if not for Loki teleporting him out at the last minute.
It's certainly never been shown that he could ever get one over on Thanos, much less take advantage of any obsolete bionics in Thanos's body, which itself presumes that A) Thanos even has any obsolete pieces. For a guy who's constantly trying to make himself more powerful, he's not going to pass up an opportunity to improve himself, and B) That any obsolete piece isn't still far beyond Doom's technical expertise, or C) That affecting such a piece in any way would have any meaningful effect on Thanos. Nevermind that whatever bionics Thanos has, they've never been of any importance other than a passing reference to where he got some of his powers. They've certainly never been described as a weakness.
So yeah, the only place I could see such an event occuring is in fan fiction, because nothing I've ever seen has shown me that that would ever happen.
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