I do have to say that I never actually knew what Hydra's evil plan was and, frankly, it was better that way.
LOL. McGuffins are hard to care about.

You just learn that Hydra has seized control of SHEILD and there's something big going down elsewhere and Nick Fury is dead and nobody knows who to trust and upsetting things happen with characters you actually care about and then everything ends in disarray. Like, nobody knows what's happening.
Yeah, that sounds better.

I did not know that. Fun!
He's the brain-y genius who works out the slingshot thing.