MAX‘s new series The Pitt throws viewers right into the trenches of a fifteen hour shift at the fictional Pittsburgh Trauma Medical Hospital’s emergency room. Guiding us through this hellacious fifteen-episode-long grind — like Virgil leading Dante through the agonies and ecstasies of heaven and hell — is Noah Wyle‘s chief attendant Dr. Michael “Robby” Robinavitch. Dr. Robby is kind, brilliant soul, tortured by his own trauma, but nonetheless determined to save as many people as possible, minute by minute, in the overburdened ER they’ve nicknamed “the Pitt.”

Casting Noah Wyle in a tense emergency room drama is something of a masterstroke. After all, the actor first shot to fame playing wide-eyed intern John Carter in the pilot episode of NBC’s groundbreaking medical drama E.R. Wyle continued playing the role of Dr. Carter for a further eleven seasons, dipping out briefly, before returning for the show’s final, fifteenth season. Wyle offers viewers of The Pitt a welcome, familiar, and comforting guide into this new MAX series.

However, the medical procedural is, by design, an ensemble show. Doctors and nurses and orderlies work in tandem to save lives, while each episode introduces a new cast of supporting guest stars playing patients with meaty backstories. If you find yourself tuning into The Pitt on MAX over the next fourteen weeks, you might initially find yourself overwhelmed keeping the doctors, interns, med students, and nurses of PTMH straight. You’ll need a Pitt cast guide.

Whether you’re trying to remember who plays the hunky Dr. Langdon or are wondering why the bumbling Whitaker seems familiar, here’s your guide to the actors in MAX’s The Pitt. From Noah Wyle to Shawn Hatosy, here’s Decider’s The Pitt cast guide:

The first two episodes of The Pitt stream exclusively on MAX tonight, January 9, at 9 PM ET.