The Big Bang Theory cast is officially signed, sealed and they will start to deliver tomorrow:

Production on Season 8 is a go.

As previously reported, Jim Parsons, Johnny Galecki and Kaley Cuoco all signed new $1 million-per-episode deals earlier this week - and now we can confirm that Simon Helberg and Kunal Nayyar have also agreed to new deals.

The actors had been making $125,000 and $75,000 per episode, respectively, and it's unknown just what the terms of their new contracts are. (UPDATE: one report says the actor now make EIGHT times as much as they used to.)

But Melissa Rauch and Mayim Bialik are on different contract schedules and did not have to negotiate this summer and everything is set to start being funny again.

"Production on Season 8 of The Big Bang Theory will begin Wednesday, August 6, with contract negotiations now having been concluded," a rep for Warner Bros says.

The Big Bang Theory Season 8 premiere will be one hour long and air on September 22.

Refresh your memory now with our section The Big Bang Theory quotes.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.