Heather Morris and a host of former Glee stars will reunite for the show's 100th episode.

Glee co-creator Ryan Murphy announced on his Twitter account this week that all of the original cast members are being invited back for the celebratory episode. He has now confirmed that Heather - who played cheerleader Brittany S. Pierce in the show - will return, along with Harry Shum Jr. (Mike), Mark Salling (Puck), Dancing with the Stars winner Amber Riley (Mercedes) and Kristin Chenoweth (April), who won an Emmy for her guest turn.

Heather hasn't appeared in the program since the fourth-season finale when Brittany was written out of the series, after announcing she was bound for early admission to the Massachusetts Institute of Technology. Since her exit, actress Heather and her boyfriend Taylor Hubbella welcomed their first child in the world, Elijah, who was born in September.

Whether Dianna Agron, who played Quinn, will return for the special episode remains unclear. The actress has not appeared since the 14th episode of Glee's fourth season and was not a part of season five's tribute to late star Cory Monteith.

Cory, 31, was found dead on July 13 in his Vancouver hotel room after overdosing on a toxic combination of heroin and alcohol.

The 100th episode of Glee is scheduled to air on March 18, 2014 on Fox.

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