Glee Sneak Peek: Jacob And Ryder Belt It Out (For Marley?), The Warblers Return And More Grease

GLEE: Blaine (Darren Criss, L) and Sugar (Vanessa Lengies, R) perform in the "Glease" episode of GLEE airing Thursday, Nov. 15 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Mike Yarish/FOX

GLEE: Blaine (Darren Criss) performs in the "Glease" episode of GLEE airing Thursday, Nov. 15 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Mike Yarish/FOX

GLEE: The glee club performs a musical in the "Glease" episode of GLEE airing Thursday, Nov. 15 (9:00-10:00 PM ET/PT) on FOX. Pictured L-R: Jacob Artist, Jenna Ushkowitz, Blake Jenner, Melissa Benoist, Vanessa Lengies, Becca Tobin and Samuel Larsen. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: New Directions perform in the "Glease" episode of GLEE airing Thursday, Nov. 15 (9:00-10:00 PM ET/PT) on FOX. Pictured L-R: Becca Tobin, Chord Overstreet, Jenna Ushkowitz, Blake Jenner and Melissa Benoist. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Kitty (Becca Tobin, second from L) has a slumber party in the "Glease" episode of GLEE airing Thursday, Nov. 15 (9:00-10:00 PM ET/PT) on FOX. Also pictured L-R: Melissa Benoist, Jenna Ushkowitz, Alex Newell and Vanessa Lengies. ©2012 Fox Broadcasting Co. CR: Beth Dubber/FOX

GLEE: Kurt (Chris Colfer, L) and Rachel (Lea Michele, R) watch a show in the "Glease" episode of GLEE airing Thursday, Nov. 15 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Jake (Jacob Artist, L) and Ryder (Blake Jenner, R) perform in the all- new "Dynamic Duets" episode of GLEE airing Thanksgiving night Thursday, Nov. 22 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Jordin Althaus/FOX

GLEE: Marley (Melissa Benoist) is surprised in the all-new "Dynamic Duets" episode of GLEE airing Thanksgiving night Thursday, Nov. 22 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Jordin Althaus/FOX

GLEE: Ryder (Blake Jenner, L) and Jake (Jacob Artist, R) perform in the all-new "Dynamic Duets" episode of GLEE airing Thanksgiving night Thursday, Nov. 22 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Jordin Althaus/FOX

GLEE: Jake (Jacob Artist) performs in the all-new "Dynamic Duets" episode of GLEE airing Thanksgiving night Thursday, Nov. 22 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Jordin Althaus/FOX

GLEE: Marley (Melissa Benoist, C) has a conflict in the "Thanksgiving" episode of GLEE airing Thursday, Nov. 29 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Ryder (Blake Jenner, L) and Jake (Jacob Artist, R) work together in the "Thanksgiving" episode of GLEE airing Thursday, Nov. 29 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. Cr: Jordin Althaus/FOX

GLEE: The Warblers perform in the "Thanksgiving" episode of GLEE airing Thursday, Nov. 29 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: New Directions perform in the "Thanksgiving" episode of GLEE airing Thursday, Nov. 29 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: New Directions perform in the "Thanksgiving" episode of GLEE airing Thursday, Nov. 29 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. CR: Adam Rose/FOX

GLEE: Kurt (Chris Colfer) celebrates Thanksgiving in New York in the "Thanksgiving" episode of GLEE airing Thursday, Nov. 29 (9:00-10:00 PM ET/PT) on FOX. ©2012 Fox Broadcasting Co. Cr: Jordin Althaus/FOX