We've got two - count 'em TWO - guest stars on the next new episode of Glee, which will be airing on May 4: Olivia Newton-John and Molly Shannon.  We have a promo and a short synopsis of the episode for you below.  Sorry, no photos yet, but we'll post them if FOX releases them.

THE RUMOR MILL IS ABUZZ ON AN ALL-NEW “GLEE” ON TUESDAY, MAY 4, ON FOX

Olivia Newton-John (“Grease”) and Molly Shannon (“Saturday Night Live”) Guest-Star

Mr. Schuester starts an investigation when a salacious list about members of the glee club circulates the halls of McKinley High. Meanwhile, Sue is mortified when a video of her performing the Olivia Newton-John classic “Physical” surfaces in the all-new “Bad Reputation” episode of GLEE airing Tuesday, May 4 (9:00-10:00 PM ET/PT) on FOX. (GLE-117) (TV-14 D, L, S)

Cast: Matthew Morrison as Will Schuester; Jessalyn Gilsig as Terri Schuester; Jane Lynch as Sue Sylvester; Lea Michele as Rachel Berry; Cory Monteith as Finn Hudson; Jayma Mays as Emma Pillsbury; Dianna Agron as Quinn; Chris Colfer as Kurt; Kevin McHale as Artie; Amber Riley as Mercedes; Mark Salling as Puck; Jenna Ushkowitz as Tina

Guest Cast: Olivia Newton-John as Herself; Molly Shannon as Brenda Castle; Jonathan Groff as Jesse St. James; Robin Trocki as Jean Sylvester; Mary Jo Carlett as Mrs. Carlisle; Naya Rivera as Santana Lopez; Heather Morris as Brittany; Dijon Talton as Matt Rutherford; Harry Shum as Mike Chang; Stephen Tobolowsky as Sandy Ryerson; Patrick Gallagher as Ken Tanaka

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