Cherish the moment of Monteith at Glee Series

Monteith began his acting career in Vancouver, British Columbia. He played minor roles in Final Destination 3, Whisper, and Deck the Halls. He had a recurring role in Kyle XY. He also made guest appearances in television serials such as Smallville, Supernatural, Flash Gordon, Stargate Atlantis, and Stargate SG-1. In 2005, he appeared in Killer Bash, about a tormented geek's soul that was taking revenge on his murderer's children by taking over a girl's twin body. The following year, he made a brief appearance in Urban Legend: a Bloody Mary. In 2007, he starred in the MTV series Kaya as Gunnar.In April 2010, Monteith was cast in the romantic comedy movie Monte Carlo. In December 2010, it was announced that Monteith would be starring in and co-producing a new untitled workplace-caper comedy for Fox 2000.

In January 2011, he shot the film Sisters & Brothers with Dustin Milligan, which premiered at the Toronto International Film Festival on September 11, 2011. Canadian director Gia Milani's film All The Wrong Reasons stars Monteith as "a big box department store manager whose wife is struggling with post-traumatic stress disorder." Milani suggests he was excited to play his own age, in a "heavy role." He filmed his part on weekdays, flying to Los Angeles on weekends to do promotional work for Glee.

lee is a musical comedy-drama television series that airs on Fox in the United States. It focuses on the high school glee club New Directions competing on the show choir competition circuit, while its members deal with relationships, sexuality and social issues. The initial main cast encompassed club director and Spanish teacher Will Schuester (Matthew Morrison), cheer leading coach Sue Sylvester (Jane Lynch), guidance counselor Emma Pillsbury (Jayma Mays), Will's wife Terri (Jessalyn Gilsig), and eight club members played by Dianna Agron, Chris Colfer, Kevin McHale, Lea Michele, Cory Monteith, Amber Riley, Mark Salling and Jenna Ushkowitz. For the second season, formerly recurring cast members Mike O'Malley, Heather Morris and Naya Rivera were promoted to the main cast. In the third season the main cast remained at fifteen, with Harry Shum, Jr. and Darren Criss promoted to it, while Gilsig and O'Malley no longer received star billing. The fourth season began with fourteen in the main cast, with Chord Overstreet being promoted, and Mays and Agron were removed and demoted to recurring cast. The fifth season saw the biggest change, with Monteith's death, and Morris, Riley, Salling and Shum all going down to recurring status. At the same time Jacob Artist, Melissa Benoist, Blake Jenner, Alex Newell and Becca Tobin were promoted to the main cast.

The series has many supporting characters, including faculty members, students and relatives of the glee club members. Broadway stars including Idina Menzel, John Lloyd Young, Jonathan Groff, Phoebe Strole and Kristin Chenoweth have been featured in guest roles. A number of the principal actors were cast directly from Broadway, while those without theatrical backgrounds were required to demonstrate singing and dancing as well as acting ability.