Molly Shannon is an American actress and comedian, best known for her work on the television show Saturday Night Live (SNL) during the 1990s. She gained fame for her unique characters, including the exuberant Mary Katherine Gallagher, which showcased her talent for physical comedy and improvisation. Shannon's performances earned her critical acclaim and a loyal fan base. In addition to her work on SNL, Molly Shannon has appeared in various films and television series, such as Superstar, Wet Hot American Summer, and The White Lotus. She has also authored a memoir titled Hello, Molly!, sharing her experiences in the entertainment industry and her personal life.