Season 1: "Safety Dance"
Back in season 1, wheelchair-bound Artie Abrams got a chance to dance.
It was all a dream sequence of course, but the folks at Glee put actor Kevin McHale's dance skills in the spotlight via flash mob in the Lima, Ohio mall.
Season 1: "Don't Rain on My Parade"
Rachel Berry belted out a "Funny girl" number she'd been practicing since the age of 4.
Rachel may seem like a diva, but just like her idol Barbra Streisand, Rachel delivered a powerhouse performance when it mattered the most , carrying the New Directions to their first sectionals victory.
Season 4: "The Scientist"
It may not have been the happiest hour for McKinley's favorite students last season, but all four of the main couples covering Coldplay's power ballad "The Scientist" as their relationships came tumbling down was the bittersweet cherry on top of one of the most memorable episodes of the series.
Season 2: "Teenage Dream"
Just when you thought the New Directions was the only glee club in Ohio, the Dalton Academy Warblers came along in Season 2 and made a record-breaking debut.
"Teenage Dream" became the best-selling Glee single back in 2010, and the episode marked the Glee debut of Darren Criss's Blaine Anderson.
Season 1: "Don't Stop Believing"
The first perfomance from the New Directions on the McKinley high auditorium stage lifted Journey's hit out of the ''guilty pleasure'' pile and made audiences realize that this group of kids, and this show, were something special.
Season 5 of Glee premieres Thursday, Sept. 26 at 8:00 p.m. on Fox.