"Life in the Fast Lane" is the ninth episode of the first season of the television show "The Simpsons," which originally aired on March 18, 1990. In this episode, Marge becomes concerned about the monotony of her life and decides to take up bowling to add some excitement. However, she soon meets Jacques, a suave French bowling instructor, and becomes infatuated with him.

As Marge spends more time with Jacques, she starts neglecting her family, causing Homer to become suspicious of their relationship. Homer hires a private investigator to follow Marge and finds out about her affair with Jacques. Meanwhile, Bart and Lisa are struggling with the guilt of knowing about the affair but not telling Homer.

The episode is a mix of humor and drama, highlighting the ups and downs of marital relationships and the consequences of infidelity. It also explores the importance of communication and honesty in a marriage. "Life in the Fast Lane" is a classic episode that has been well-received by fans and critics alike for its emotional depth and comedic moments.