6) Avengers: Endgame (2019) - $356M

Being the final film of the Infinity saga, Endgame needed to be the most costly as it brought all the characters into a climactic battle. All the previous films' characters returned to witness the epic battle; even the final battle scene became the new benchmark with so much CGI. And indeed, the gamble worked because Endgame became the highest-grossing movie ever at $2.79 billion.
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Edited by Apoorva Jujjavarapu