The documentary chronicles the Apple Lisa, a revolutionary computer that debuted the graphical user interface (GUI) and mouse to the public before the Macintosh. Initially a commercial failure due to its steep price, the Lisa's innovations, heavily influenced by Xerox PARC, laid the groundwork for modern computing. After Apple struggled to sell it, the Lisa was rebranded as the Macintosh XL and eventually thousands of unsold units were famously buried to secure tax write-offs and avoid market competition with new Macs. However, companies like Sun Remarketing salvaged and upgraded many Lisas, extending their life. Today, the Lisa remains a highly prized collectible, with dedicated communities and independent engineers developing new components, ensuring its undeniable legacy in computing history.