A Christmas Car-Roll

A Christmas Car-Roll is the twelfth episode of the fourth season of Scorpion, and the eighty-third of the series overall.

Synopsis
''On Christmas Eve, when Walter chooses work over spending quality time with his friends, he falls down the stairs and hits his head. As he lays unconscious, he enters a dream world where Team Scorpion never existed.''

Main

 * Elyes Gabel as Walter O'Brien
 * Katharine McPhee as Paige Dineen
 * Robert Patrick as Cabe Gallo
 * Eddie Kaye Thomas as Toby Quinn-Curtis
 * Jadyn Wong as Happy Quinn-Curtis
 * Ari Stidham as Sylvester Dodd

Recurring

 * Riley B. Smith as Ralph Dineen
 * Tina Majorino as Florence Tipton
 * Andy Buckley as Richard Elia

Trivia

 * The title is a reference to the combination of the situation and the changes Walter goes through during the episode. In the beginning he angrily tells his friends that he doesn't really need them. However, after he suffers a bad fall down the stairs, his dream world revises his feelings towards his friends. Much like Ebenezer Scrooge in "A Christmas Carol", Walter's view changes for the better and gives him a much clearer picture of what his life would be like without any of the others. The Car-Roll replaces Carol in the title to reference his dream world at how he is trapped in an upside down wrecked car and that leads to his realizing how he actually does need his friends and cares deeply about them.