What would it take to knock a whole planet to 90 degrees of inclination relative to the sun?

Pluto is inclined in a way that makes it slightly off the orbital plane of all the other planets and sun. Could you have a planet that was inclined at 90 degrees, or at least close to that? What would make something like that happen (i.e. it collided with something and somehow the force was enough to take it all the way up to that type of orbit, or could it be a captured planet?) A planet couldn't form that way from the protoplanetary disk, could it? If something crashed into it hard enough to make it do that, how big would the planet orbiting have to be? The thing that crashed into it?

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What would it take to knock a whole planet to 90 degrees of inclination relative to the sun?

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