Lex Murphy is the computer-skilled child who helps the heroes in the 1993 film Jurassic Park.
Lex is John Hammond’s granddaughter and arrives on Isla Nublar with her younger brother Tim. During the park’s systems failure, she uses her knowledge of Unix computers to access the control system and restore security functions, helping Alan Grant and the others escape.
The film’s famous computer-room scene presents Lex as a hacker, although the story also identifies her as a skilled computer user rather than focusing on modern cybersecurity terminology. Her contribution is crucial because the adults initially cannot operate the park’s interface.
Lex is played by Ariana Richards, while Tim Murphy is played by Joseph Mazzello. The siblings are often mentioned together, but Lex is the character associated with restarting the computer systems.