The Big Bang Theory The Big Bang Theory

The Big Bang Theory is set to resume production at the end of this month, but most of its cast members are currently without contracts, Deadline reports.

Stars Jim ParsonsJohnny GaleckiKaley Cuoco-SweetingSimon Helberg and Kunal Nayyar were all working under contracts that expired at the end of last season. (Melissa Rauch andMayim Bialik are still under the contracts they each renegotiated last fall.)

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The cast faced a similar situation when they were renegotiating their contracts in 2010; however, at that time they were still obligated to show up to work under existing contracts that had not yet expired, Deadline notes.

Though production on Season 8 of the CBS comedy, which is the No. 1 show on television, is scheduled to begin on July 30, the date may be pushed if the two sides can not reach an agreement. Big Bang's one-hour season premiere is scheduled for Monday, Sept. 22.

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In March, CBS renewed the show for three seasons, contingent upon the current cast returning.

In Season 7, Galecki, Parsons and Cuoco-Sweeting each commanded about $350,000 per episode. Deadline reports that they could earn up to $1 million per episode.

(Full disclosure: is owned by CBS.)

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