You see, it is a matter of absolute fact that Disney had his head frozen (I heard it from a bloke down the pub, or at least I would have if I were much of a pub-goer). So, in the future, when his head is revived and transplanted on to a robot body, he would journey to the past to warn his past self of the my arrival.
So I was never going to stand a chance against Walt Disney and his timetravelling robot future self. Not a chance.
And with the pioneers of the past wiped out, Disney could claim he invented animation all by himself and the world becomes one giant Disneyland ruled by an army of rodent-shaped robots.
I set out to save the world and doomed it instead.