Mary is devastated that Halloween has been cancelled by the city. Mark goes toe-to-toe with a kid at school who doesn't believe in wearing a mask.
Geoff and Erica come to a point in the relationship where they realize they are in different places in college. Geoff makes an important decision while Beverly tries to find a new purpose in her life as she seeks political office.
The gang decides to head to Vegas for the week on a party bus. Sheldon learns about the importance of empathy and saying sorry.
When the gang finds out about Bernadette’s pregnancy, they celebrate by singing karaoke. Also, Wolowitz freaks out over her pregnancy announcement and is convinced he must make more money to provide for the baby.