Stan Lee Denies Reports of Elder Abuse, Threatens Legal Action

Stan Lee is mad as hell over reports he's being abused and taken advantage of, because he says they're completely untrue ... and he's going to do whatever it takes to set the record straight.

The legendary Marvel creator tells TMZ ... material recently published about him and his friends -- specifically Keya Morgan -- is nothing but slander. Lee says the claims are "hateful and harmful" and he can't even believe some of the accusations.

Stan's adamant he's not being mistreated, and suggests someone might have a personal vendetta. In any event, he's ready to take legal action against any media outlets wrongly trashing him.

As we've reported ... Lee's endured several rough months. He's been dealing with a bizarre blood heist, millions of dollars disappearing, pneumonia, and the death of his wife.

The man's fed up. 'Nuff said.