19. Thor Being Played By Two Actors (Thor)
In the beginning of the 2011 film, Thor, the titular character declares an unsanctioned attack upon the Frost Giants, forcing his father to depower him before banishing him to Earth. To reclaim his godlike power, Thor must prove he is worthy to hold his enchanted hammer, Mjolnir.
This story sounds pretty standard (apart from the Frost Giants). But the original idea had one huge difference. When Thor debuted in the comics, the God of Thunder could turn into a normal man called Donald Blake if he tapped his cane. Thor reverted to his mortal form if he let go of his enchanted hammer, Mjolnir, for longer than a minute. This idea was eventually abandoned in the comics for being unnecessarily convoluted.
In the original script, Thor transformed into Blake when he was banished to Earth and would have no memory of his life in Asgard. In his human form, Thor would have been played by Kevin McKidd, who is best-known for playing Tommy in Trainspotting and Owen Hunt in Grey's Anatomy. This idea was dropped as it was too confusing.
The only reference to this storyline is when Thor holds up a t-shirt with a name-tag that reads "Donald Blake".