Spencer Hastings is an overachiever. She tries to do it all, from school, to intersnhips to charity work and field hockey.
Spencer would actually stand up to Alison back in the day, but she has problems at home with her annoying sister, Melissa. How does Spencer get back at her? In the opening episodes, by crushing on Melissa's fiance.
Melissa: When did that happen?
Spencer: What...Caleb were friends?
Melissa: Really? 'Cause? I know how you like to shop out of other people's carts.
Game on, Charles.Spencer