When the Fantastic Four and the Avengers sacrificed their lives to destroy Onslaught, Franklin Richards, the son of the FF's Mr. Fantastic and Invisible Woman subconsciously created a pocket universe to save their lives. There they spent an entire year reliving living new lives "reborn" into a reality where they recently gained their abilities that vaguely mirror how they gained their powers originally. The first person to sacrifice himself was the thunder god Thor.
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This version of Thor would be trapped in a block of ice in Norwary and discovered by scientist Donald Blake. Thinking himself to be the real Loki from Earth-616, the Loki of Counter-Earth would then trick the newly formed Avengers to revive this Thor and trick him into attacking the heroes. Thor would soon see through Loki's deception and aid the Avengers in his defeat, and join the group. This would set in motion Loki's plot to get ultimate revenge against the Avengers
