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Usher portrays Sam Elijah, a third-year Emergency Medicine Resident.
Muirhead is Sophie Chan.
Nieves will play Camila Perez.
L-R: Jack Bannon, Jessie T. Usher, Chelsea Muirhead, Daniela Nieves & Jessy YatesRuth Crafer/Getty/Calyssa Lorraine/Emily Sandifer/Thomas Brunot
Yates will play Harper.
Robyn and Cuse serve as showrunners and executive producers.
Bradley Garner, Emma Forman and Michael Klick also executive produce.
Kate Dennis will serve as director and executive producer on Episodes 1 and 2.
He recently starred as the title character Alfred Pennyworth in Max seriesPennyworth,which ran for three seasons.
His other credits include UK seriesEndeavourand filmsKids in Love, The Imitation GameandFury.
