The Laureate Accumulation Season 12, Episode 18 - Aired April 4, 2019
When competitors Pemberton and Campbell charm America on a publicity tour, Sheldon and Amy try to bring Nobel laureates Kip Thorne, George Smoot and Frances Arnold to their side. Also, Halley's fear of the dark leads to opportunity and conflict for Howard, Bernadette and Stuart.
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Guest Stars: Kevin Sussman as Stuart, Joshua Malina as President Siebert, Sean Astin as Dr. Pemberton, Kal Penn as Dr. Campbell, Dr. George Smoot as Himself, Professor Frances H. Arnold as Herself, Professor Kip Thorne as Himself
Director: Mark Cendrowski