Credit: Jason Merritt/Getty Images

With about a month until The Unauthorized O.C. Musical takes the stage, there’s been a shakeup in Orange County. The Flash‘s Rick Cosnett vacated his role as Sandy Cohen due to scheduling conflicts, the production reported via Twitter Monday, but he’s been replaced by Lost actor Neil Hopkins.

Hopkins played Charlie Pace’s (Dominic Monaghan) brother and Drive Shaft bandmate Liam on Lost. The rest of the Unauthorized O.C. Musical cast includes: Jersey Boys’ Drew Seeley as Luke Ward, Step by Step’s Christine Lakin as Kirsten Cohen, BuzzFeed editor Jarett Wieselman as show creator Josh Schwartz, The O.C.’s Autumn Reeser as Julie Cooper, Pretty Little Liars’ Brendan Robinson as Seth Cohen, Nashville’s Tilky Jones as Ryan Atwood, Awkward’s Greer Grammer as Summer Roberts, and Cruel Intentions The Musical’s Molly McCook as Marissa Cooper.

The cast had their first table read on Saturday, in preparation for the musicalto take the stage for one night only in Los Angeles’s The Federal Bar on Aug. 30.

Earlier this month, co-creator Jordan Ross told EW that fans won’t be able to see each iconic O.C. moment during the live production, but will instead focus on bringing what fans loved about the entire series to the stage through its memorable music.

“We decided to go back to that moment where they first fell in love with the show and in order to build on that, we use music from all four seasons,” Ross said. “So even if that music moment that you loved in the series isn’t in the show, you’re going to feel it. A really good example is ‘Champagne Supernova.’ So you’re not going to see the upside-down Spider-Man kiss because we’re not doing that scene but you will feel that moment between Seth and Summer; it’s sung by Seth and Summer, so you’re going to get it.”