The title "" refers to the eighth episode of Grey's Anatomy , Season 10. It originally aired on November 7, 2013, and is best known for the intense, "dark and twisty" fallout between Meredith Grey and Cristina Yang . 🏥 Key Plot Points
: The couple makes a "bold decision" regarding their relationship, specifically choosing to wait until marriage for sex.
: Shane Ross sides with Cristina against Meredith to use the 3D printer. [S10E8] Two Against One
: Callie and Arizona are forced to navigate the presence of Owen’s new serious partner.
: Meredith feels isolated as her best friend and her research goals are pitted against her. The title "" refers to the eighth episode
: Miranda Bailey deals with the sudden return of Ben Warren , who quit his surgical residency to be with her. She begins exhibiting signs of OCD, which starts to interfere with her performance in the OR.
: Tensions between the "twisted sisters" reach a boiling point. Cristina betrays Meredith by using Meredith's 3D printer for her own research on a terminal baby, despite Meredith’s clear refusal. : Shane Ross sides with Cristina against Meredith
: Fans remain divided over the betrayal. Many on Reddit felt Meredith was being overly possessive of her project, while others argued Cristina was out of line for going behind her friend's back. "Grey's Anatomy" Two Against One (TV Episode 2013) - IMDb