In the second minute of extra time, all eyes were on Roosters halfback Cooper Cronk, who was playing in his first game back at AAMI Park since his 2017 departure from the Storm.
But the premiers turned to Mitchell, who slotted over the match winner from 40m out to end Melbourne's unbeaten start to the season.
It ended an epic comeback from the Storm, who trailed 20-8 at halftime as they failed to keep pace with the champions early on.
"It was uncomfortable and beautiful all in one," said Roosters coach Trent Robinson.
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