The 2026 One Chicago crossover has finally arrived, and with it comes the chance to see all of our favorite characters from Chicago Fire, Chicago Med, and Chicago PD come together. Of course, for a crossover of this size, the shows have also brought in some amazing guest performers!
Perhaps the most notable face to pop up briefly in the One Chicago crossover event is actor Wallace Langham! Langham appears early in the action, playing Darren Jackson, an operation supervisor with air traffic control who is tied to the passenger jet mystery.
Langham is best known for playing David Hodges on CSI for 13 seasons of CBS’s hit series. He’d later reprise the role in the show’s spinoff, CSI: Vegas, during a four-episode guest stint back in 2021. Since CSI wrapped, Langham has kept busy appearing in a number of recent titles, including George & Mandy’s First Marriage, Perry Mason, 1923, The Rookie: Feds, Physical, and Mom.
Speaking of familiar faces, Daniel Di Tomasso is back as Lt. Zachary "Zach" Torbett is a Special Operations Lieutenant of Hazmat. It’s been a while since we’ve seen DiTomasso back in Chicago reprising his role for the first time since season 6. In addition to his role on Chicago Fire, newer fans might recognize him from some of his many other TV credits, which include CSI: Vegas, Dynasty, Major Crimes, and Witches of East End.
Also guest starring in the episode is John Marshall Jones, who plays David Conway, the Weapons of Mass Destruction coordinator for the FBI Chicago field office. Jones is one of those actors who has built a career playing smaller roles in dozens of hit series, including playing Nelson Bradford in For All Mankind, Clevon “Smitty” Smith in In The Cut, Special Agent Jay Griffin in Bosch, and Wally in Hart of Dixie. His additional credits include Big Little Lies, All American: Homecoming, The Morning Show, Haus of Vicious, 911, Grand Hotel, and The Troop.
Next we have Bernard White, who plays medical examiner Dr. Woodward. White is likely to look familiar to fans of CBS’s hit comedy Ghosts. White plays Mahesh, the father of Utkarsh Ambudkar’s character Jay, in the show – who was also the namesake of the restaurant Jay and Sam open on the grounds of their B&B. Of course, this is just one of many roles White has played over the years with additional credits that include Kidding, Beef, Captain America: The Winter Soldier, It’s Kind of a Funny Story, Silicon Valley, Dragnet, General Hospital, Santa Barbara, and Rama-Kandra in The Matrix franchise.
Then we have Tracey Bonner, who guest stars as Pamela, Macy’s mom. Sweet Magnolias fans will immediately recognize Bonner from her role as Pastor June in Netflix’s hit drama. Fans might also recognize her as playing Simone Carr in Raising Dion or for her roles in hits such as Black Lightning, Jumanji: Welcome to the Jungle, The Exorcism, and The Beanie Bubble.
Rounding out the guest cast for the episode is Chicago reporter Matthew Rodrigues, who fittingly plays a reporter in the show. And then we have Joe Edward Metcalfe playing Thomas Marr, the man at the heart of the event. Metcalfe has mostly appeared in smaller titles, including The Last of Us: Ellie’s Return, Whispers of the Witching Hour, Next, and McKinsey Manor Massacre.