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In an SF show, a mentally-retarded minor character is introduced. Phlebotinum causes this person to become mentally supercharged.
This trope differs from "Flowers for Algernon" Syndrome in that, with the latter, the focus is exploring the effect of the change upon the character. With this trope, the character's purpose is to demonstrate the effect of the phlebotinum.
I have two examples, both from Doctor Who: Tommy in "Planet of the Spiders" and Ms Evangelista in "Silence in the Library"/"Forests of the Dead".