Revisit the best moments from SNL's recurring character Mary Katherine Gallagher, from her debut appearance in the St. Monica’s High School Talent Auditions to popular sketches featuring guests like Will Ferrell, Amy Poehler, Jimmy Fallon and more. Saturday Night Live. Stream now on Peacock: pck.tv/3n1IyzK St. Monica's High School Talent Auditions | youtu.be/OY2bBzz5kwc St. Monica's Spelling Bee | youtu.be/JQ2Y11KbonE Mary Katherine Gallagher at TGI Fridays | youtu.be/wsmy3tspZdQ Mary Katherine Gallagher Wants to Join a Gang | youtu.be/HVTgNgjHCp8 Mary Katherine & Lenny | youtu.be/V2AaKAAdd5E Subscribe to SNL: goo.gl/tUsXwM Stream Current Full Episodes: nbc.com/saturday-night-live WATCH PAST SNL SEASONS Google Play - bit.ly/SNLGooglePlay iTunes - bit.ly/SNLiTunes SNL ON SOCIAL SNL Instagram: instagram.com/nbcsnl SNL Facebook: facebook.com/snl SNL Twitter: twitter.com/nb...