As soon as Thanos has finally acquired all six Infinitiy Stones, he is immediately confronted by (in this order) Doctor Doom, the Super Hero Squad and the Silver Surfer, wielder of the Infinity Sword.
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Title card's issue homage: Silver Surfer v2 #34. See more
I could leave you all like this, but everyone knows that just like act three always follows act two, something will come along to unfreeze you.