How is Guardians of the Galaxy connected to Avengers?

How is Guardians of the Galaxy connected to Avengers?

It’s the Infinity Stones that is going to later connect the characters of the Guardians of the Galaxy and the Avengers. This slew of Marvel Movies in all the Phases have one common end point, ie THANOS and the INFINITY STONES, we’ll probably see them meeting up in Avengers Infinity War movie and it’s sequel.

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