Scott Pilgrim, a quirky, unemployed twenty-two-year-old bassist for an indie garage band in Toronto, finds himself dating Knives Chau, an eager high schooler. Scott’s friends criticize the relationship due to the age gap, but Scott remains comfortably numb until he experiences a vivid dream about a dazzling delivery girl with roller skates and frequently changing dyed hair.Days later, at a local concert, Scott crosses paths with that exact dream girl: Ramona Flowers. Utterly infatuated, Scott aggressively pursues her, abruptly dumping Knives, which shatters the heartbroken teenager. Ramona and Scott begin dating, but their budding romance is violently interrupted when Ramona’s mysterious ex-boyfriend, Matthew Patel, crashes a
battle of the bands. Matthew attacks Scott, revealing that to date Ramona, Scott must defeat her "League of Evil Exes"—a cabal of seven powerful, eccentric ex-lovers determined to destroy any new man in her life.Motivated by deep affection and a desperate need to prove his worth, Scott reluctantly faces each formidable challenger. He defeats Lucas Lee, a swaggering Hollywood stuntman turned director; Todd Ingram, a vegan bass player possessing psychic abilities derived from his strict diet; and Roxy Richter, a half-ninja ex-girlfriend. Along the way, Scott’s personal life crumbles under the emotional weight of his battles. His obsession with Ramona alienates his bandmates, his sister, and the devastated Knives, forcing him to confront his habit of treating people poorly and drifting through life without
accountability.Scott confronts the remaining twins, Ken and Kyle Katayanagi, at a club showcase, defeating them with the help of his band. This leaves only the shadowy mastermind behind the League: Gideon Graves, the charismatic owner of the Chaos Theatre and Ramona’s controlling, abusive final ex.Arriving at the club, Scott learns Ramona has been magically bound to Gideon. Challenging Gideon for her heart, Scott initially gets defeated and killed, but he earns a "1-Up" life extension through a sheer display of character growth, acknowledging his past mistakes. Revived, Scott realizes his ultimate enemy isn’t just Gideon, but his own inner self. He faces Nega-Scott, his dark, repressed counterpart representing all his flaws and insecurities. Instead of fighting him, Scott embraces Nega-Scott, merging with him to unlock his ultimate potential and achieve emotional maturity.Equipped with the "Power of Self-Respect," Scott fights and defeats Gideon once and for all, freeing Ramona from the psychological chains of her past. With the League defeated and his integrity restored, Scott makes amends with Knives Chau. Ramona, finally free to choose her own destiny rather than being controlled by her exes, decides to give Scott a genuine, fresh start. The two walk hand in hand into the digital sunset, ready to build a healthy, mature relationship together.