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The deception unravels quickly, prompting the university to bring in a mediator: , the new director of experimental cosmology played by guest star Ming-Na Wen. Dr. Lee wastes no time establishing dominance. When Sheldon tries to assert his typical intellectual superiority, he finds himself completely outmatched by Dr. Lee's sharp wits and refusal to indulge his tantrums. This introduces a rare dynamic where Sheldon is completely marginalized in his own lab. Mary’s Lottery Ticket Crisis young sheldon s05e14 webdl