Grey's Anatomy, one of the most popular medical dramas on television, has featured many notable guest stars throughout its 17-season run. While some of these appearances have been memorable, there are a few that may have slipped the minds of viewers. Here is a list of 20 stars who made appearances on Grey's Anatomy that you may have forgotten about.

Some of the stars on the list include familiar faces such as Christina Ricci, who portrayed a paramedic with a peculiar obsession, and Demi Lovato, who played a patient seeking treatment for a heart condition.

Other notable appearances include Mandy Moore, who portrayed a patient suffering from amnesia, and Sarah Paulson, who played a young woman struggling with a difficult decision.

These guest stars have brought their talent and star power to the show, adding depth and complexity to their respective characters. Additionally, their appearances have added excitement and intrigue for fans of the show, providing surprising twists and turns throughout the seasons.

While it's easy to forget some of these appearances due to the sheer number of guest stars on the show, it's vital to acknowledge their contributions to the success of Grey's Anatomy. Without their memorable performances, the show may not have achieved the same level of popularity and acclaim.

Overall, Grey's Anatomy continues to be a favorite among viewers, partly due to the many talented stars who have graced its episodes. Whether they were portraying patients or doctors, these guest stars have left a lasting impression on audiences and have contributed to the show's enduring legacy.