Rose is introduced as being gagged and unconscious by Emily and dragged into Emily's room at the El Royale from Emily's car. She is played by Cailee Spaeny in her first villainous role. Through it all, she manages to remain sympathetic due to how badly she's been mind raped that she's not completely to blame for her actions. When Emily abducts her in an attempt to save and cure her of Billy Lee, Rose ends up bringing him to the hotel and attributes to the chaos he brings about on the rest of the main characters.
She eventually becomes deeply indoctrinated into his manipulations to the point that she's willing to fight and kill for him at the drop of a hat.
She is the innocent younger sister of Emily Summerspring and desperate for an escape from their abusive father, Rose ends up being seduced and coaxed by cult leader Billy Lee to join him as a follower. Rose Summerspring is the secondary antagonist of the 2018 movie Bad Times at the El Royale.
