Rent Live lead Brennin Hunt has suffered a freak ankle injury on the eve of the live broadcast.
The star – who plays Roger – rolled his ankle during Saturday's dress rehearsal.
And now it is not known if he can perform in Fox's three-hour live broadcast today.
Hunt was taken to a local hospital following the dress rehearsal - his status for Sunday's live broadcast on Fox is currently not known.
However, the live event will still go on with producers now scrambling to find a potential replacement if required.
Rent is a physically demanding musical with his character, among others, involved in a lot of dancing and rushing around across multiple sets.
He network's statement read: "Last night during a live performance of Fox's production of Rent, one of the actors, Brennin Hunt, was injured. But in the spirit of Rent, everyone — producers and cast, original and current — is dedicated to ensuring that tonight's broadcast must, and will, go on."
The cast of Rent live, which includes Vanessa Hudgens, Tinashe, Kiersey Clemons and Valentina, has no understudies.
It is understood Fox is going to use some taped parts from Saturday's dress rehearsal during Sunday's live broadcast.
Rent Live Director Alex Rudzinski told reporters, said: "What we do have is a backup recording from the night before. So the night before we do a full dress rehearsal on camera to tape, so should the metaphorical meteor hit the studio, we can switch to that back up recording, and it's with an audience."
Hunt's injury occurred during the final commercial break and not while the actor-musician was on-stage.
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