Robin Williams appeared as a guest on the improv comedy show Whose Line Is It Anyway? in the year 2000, specifically in Show No. 313. During this episode, he participated in various improv games such as Film Director, Duet, Party Quirks, Scenes From a Hat, and Props, showcasing his quick wit and improvisational skills

. His performance on the show is remembered as highly entertaining and spontaneous, with Williams bringing his unique energy and creativity to the stage. He played outlandish characters and delivered rapid-fire jokes that often left both the cast and audience laughing uncontrollably. His presence elevated the performances of regular cast members like Ryan Stiles, Colin Mochrie, and Wayne Brady, who were often caught off guard by his comedic genius

. Robin Williams' single episode appearance on Whose Line Is It Anyway? remains a celebrated moment for fans of improv comedy and his work, highlighting his exceptional talent in improvisation and humor