Smallville: Season 4, Episode 19 - ProjectFreeTV

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Kevin, a boy who can cause people to temporarily lose their memory, turns his powers on Clark and causes him to have total amnesia. Chloe discovers what has happened and must teach Clark about his superpowers while simultaneously trying to keep him from accidentally revealing them to others. On his trip down memory lane, Clark meets Lana, falls in love all over again and decides to share his secret with her. Lex takes advantage of the situation and convinces Clark to show him where the three stones are hidden...