Glee's 100th episode is going to be a big one for Rachel, who is heading back to McKinley's choir room to reunite with all her pals. But what else will Rachel (Lea Michele) be doing in Season 5, Episode 12: "100"? Here's a round-up of everything we know so far!

Rachel will be singing a very sad solo song

Lea posted photos of herself singing in the choir room as April Rhodes (Kristin Chenoweth) and Schue (Matthew Morrison) watch. We don't yet know which solo song she's singing here, but it doesn't appear to be a cheery one. 

She's also rumored to be singing one of her Season 1 classics

The episode will feature a lot of previously covered Glee songs being redone in new ways. One of those is reportedly going to feature Rachel joining a few pals on this tune, which she knocked out of the park in the early days of Glee.

Finn will be mentioned in the episode

It's only fitting that New Directions will pay tribute to Finn (Cory Monteith) in the 100th episode, and the way that the show plans to honor him is very moving. 

Lea has been having fun on the set with some familiar faces

We love seeing Rachel back at McKinley, especially because it gives us the chance to see silly backstage photos of Lea with cast members whom she doesn't usually film with. How cute is this pic of Lea with Heather Morris (Brittany) and another lovely Glee star? 

Lea is just as excited to have Gwyneth Paltrow and Kristin Chenoweth back on the show as we are!

Need proof? Check out what Lea has tweeted lately: