Robert Downey Jr. improvised the iconic line at the end of the first Iron Man, changing MCU history forever.
For Groot, Vin Diesel had a script that translated every "I am Groot" into actual sentences so he could get the emotion right.
Tom Holland found out he was Spider-Man through an Instagram post by Marvel. He was so excited he broke his computer!
Vibranium isn't just for Cap's shield; it's the foundation of Wakanda's entire technology and civilization.
Stan Lee appeared in every MCU movie up until 'Avengers: Endgame' as a beloved tradition for all fans.
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