7) Jack Shephard (Lost)

When Matthew Fox was cast in Lost as Jack Shepherd, he was meant to last just for the pilot episode, with his character dying by the end of it. However, Matthew Fox portrayed the character with such authenticity, attributing qualities like responsibility and sacrifice to him, that the writers found themselves able to change the script. From lasting just for the pilot episode, he turned into the main driving force of the show.
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Edited by Anshika Jain