One of the former stars of the Fox musical series “Glee” has signed on for a return to the show in what’s turning into a full-fledged original cast reunion for its 100th episode. TheWrap.com reports that Dianna Agron, who played Quinn Fabray on the show, will be back for the special event.

Agron last appeared on the series in February. Other “Glee” alumni who will appear include Mark Salling, Amber Riley, Heather Morris and Harry Shum Jr. The episode will air March 18.

The 100th episode will include songs decided upon by fans, who will vote among 30 songs that have previously been performed on the show.

Dianna Agron