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Canonically answered

Intelligence is powerful. One might say that “Intelligence is no match for a gun, or for someone with lots of money,” but both guns and money were produced by intelligence. If not for our intelligence, humans would still be foraging the savannah for food.

Intelligence is what caused humans to dominate the planet in the blink of an eye (on evolutionary timescales). Intelligence is what allows us to eradicate diseases, and what gives us the potential to eradicate ourselves with nuclear war. Intelligence gives us superior strategic skills, superior social skills, superior economic productivity, and the power of invention.

A machine with superintelligence would be able to hack into vulnerable networks via the internet, commandeer those resources for additional computing power, take over mobile machines connected to networks connected to the internet, use them to build additional machines, perform scientific experiments to understand the world better than humans can, invent quantum computing and nanotechnology, manipulate the social world better than we can, and do whatever it can to give itself more power to achieve its goals — all at a speed much faster than humans can respond to.

See also

Non-canonical answers

AlphaGo was connected to the Internet – why shouldn’t the first superintelligence be? This gives a sufficiently clever superintelligence the opportunity to manipulate world computer networks. For example, it might program a virus that will infect every computer in the world, causing them to fill their empty memory with partial copies of the superintelligence, which when networked together become full copies of the superintelligence. Now the superintelligence controls every computer in the world, including the ones that target nuclear weapons. At this point it can force humans to bargain with it, and part of that bargain might be enough resources to establish its own industrial base, and then we’re in humans vs. lions territory again.

(Satoshi Nakamoto is a mysterious individual who posted a design for the Bitcoin currency system to a cryptography forum. The design was so brilliant that everyone started using it, and Nakamoto – who had made sure to accumulate his own store of the currency before releasing it to the public – became a multibillionaire. In other words, somebody with no resources except the ability to make one post to an Internet forum managed to leverage that into a multibillion dollar fortune – and he wasn’t even superintelligent. If Hitler is a lower-bound on how bad superintelligent persuaders can be, Nakamoto should be a lower-bound on how bad superintelligent programmers with Internet access can be.)

Unanswered non-canonical questions