Glee's deeply emotional Cory Monteith tribute episode will be something of a family reunion.
A few of the original cast members who are no longer with the series will return for the episode, along with a few returning guest stars, sources tell E! News.
If you don't want to know which actors will appear, stop reading.
Amber Riley (Mercedes), Harry Shum Jr. (Mike Chang), Mark Salling (Puck) and Jayma Mays (Emma) all will appear in the Cory/Finn tribute, according to my sources, along with Dot-Marie Jones (Coach Bieste), Kurt's father Mike O'Malley (Burt Hummel) and of course, Finn's mother Romy Rosemont (Carole Hudson-Hummel).
There may be a few more surprises, but we are told that Dianna Agron and Heather Morris weren't in the script, and aren't expected to appear.
The episode, which according to sources is called "The Quarterback," began production on Friday in Los Angeles, and Lea Michele tweeted a photo of herself wearing a "Finn" necklace while shooting it. We are told that Lea doesn't appear in the episode until the final act, and she does sing.
"We're in the middle of filming [the tribute], and it's incredibly hard," Matthew Morrison told E! News' Marc Malkin over the weekend. "We've mourned Cory, but now we're mourning Finn. So it's kind of like two people in that one person."
"There were a lot of things that we had to decide [for the memorial episode]," show creator Ryan Murphy explained to Deadline prior to shooting. "At one point, we were going to have his character die after an accidental drug overdose-- that was something we had considered. But we have decided that we're not going to have him pass from that."
Insiders confirm that the episode starts off with the news of the death, but it is not revealed how Finn died.
Co-star Jane Lynch shared her feelings about the script last week. "Just read Cory Monteith memorial episode," she wrote via Twitter. "Most beautiful thing. Thank you, @MrRPMurphy @BFalchuk Ian Brennan."
We are told the script for the episode is "so good" and "will make you cry from beginning to end."
Cory Monteith passed away from a drug overdose on July 13 in Vancouver.
If you or someone you know needs help with addiction issues, contact Narcotics Anonymous.