So, they record a message in a time capsule. Bury it for a hundred years. After a hundred years, it goes up, sends a message into space, and then sends that message back in time.
you're the guy who, two episodes ago, had been saying that everyone should give up and let HYDRA run things because it was too hard to fight back and the best you could do is run the underground railroad
Anyhow, Spencer's decided that it doesn't matter that they don't have all of the Cosmic Cube fragments because each fragment can alter reality just a little on their own
So, FalCap duels some fighter jets and tricks them into fighting each other, except one jet has a slot that opens in the cockpit so the RICO can pull out a sniper rifle and kill Sam with it.
Except Quasar magically wakes up at the last instant and Sam wills his Cube fragment to bring himself back to life (Oh, like we weren't expecting that)
And where Doctor Strange fails, Maria Hill succeeds by tracking down the last of the Pleasant Hill prisoners, who was actually Blackout, and killing him.
Oh, and the reason the Chitauri were attacking Earth was because their queen eggs were on Earth. So as soon as the shield fell, Carol blew up the eggs.
really, sam?