CBS has also picked up a spinoff of the show for next season, "Young Sheldon", which will follow Parsons' character as a boy.
All Sheldon Cooper fans can stop fretting: CBS is keeping "The Big Bang Theory", TV's most popular sitcom, for two more years. Meanwhile, series regulars Melissa Rauch and Mayim Bialik are expected to have their per-episode salary bumped up to $500,000 per episode once their contracts have been signed off.
Stars Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg and Kunal Nayyar are all set to return. The pair, who began as guest stars on season 3, have only been earning between $175,000 and $200,000 per episode as of their most recent contract negotiations.
As previously reported, the fivesome, who were each receiving $1 million per episode, offered to take a pay cut in order to boost their co-stars' pay.
Jermain Defoe admits England place may rely on him leaving Sunderland
I just haven't been able to bloody pick him!" "Just his background and what he's done in his career and at major tournaments". But the former Tottenham striker insisted he never gave up donning the Three Lions on his chest again.
While Big Bang's production price tag - covered in large part by CBS at this point in the series' run - is creeping up to an eye-popping $10 million an episode, the comedy series is in its own league performance-wise.
The comedy, which focuses on physicists Leonard (Galecki) and Sheldon (Parsons) and their circle of friends and family, remains a top hit in its 10th season, averaging 19.8 million viewers with 7-day viewing counted, a double-digit milestone that few series reach.
"Big Bang" has been the No. 1 comedy in total viewers since the 2010-11 season. Parsons will help narrate the series. Chuck Lorre, Bill Prady and Steven Molaro are executive producers.