The South Park episode "Cartman Gets an Anal Probe" is the first episode of the first season of the show, and it originally aired on August 13, 1997. In the episode, Cartman claims that he had a dream in which he was abducted by aliens and had a probe inserted into his anus. This leads the other boys to believe that he is lying, and they mock him for it.

Meanwhile, the town of South Park is experiencing strange occurrences, including cattle mutilations and mysterious lights in the sky. The boys eventually encounter the aliens responsible for these events, and they discover that the aliens are actually conducting experiments on the townspeople.

The episode is known for its crude humor and outrageous storyline, which are typical of South Park's irreverent style. It also introduces the show's main characters and sets the tone for the rest of the series. "Cartman Gets an Anal Probe" is considered a classic episode and is often cited as one of the best episodes of South Park's early seasons.