has marked 500 episodes with an emotional five-act installment that dove deep into Detective Olivia Benson's past and, of course, featured the crime drama's characteristic twists and turns.
Olivia, played by Mariska Hargitay, had a flashback at the start of Thursday's episode to a dinner she had with her late mom, Serena, during season 9.
Olivia has a complicated history with Serena, who became an alcoholic after she was raped and got pregnant with Olivia. The flashback marked the first of many familiar faces fans, and Olivia, saw throughout the episode.
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