It's 2013, and Lyft's CEO John Zimmer is hosting a little celebration for drivers when some very unwelcome interlopers turn up to crash the party. Uber’s Travis Kalanick wants to destroy Lyft at any cost, and he's willing to do what it takes to outmaneuver his competitor and steal its riders and drivers — even if it means playing dirty. Lyft decides to stick to its environmentalist roots and focus on a new ridesharing feature it hopes will woo customers away. Until Uber beats them to the punch, and drives its rival to the brink of collapse.