It’s two more years for “The Big Bang Theory.”

CBS and studio Warner Bros. Television have finally reached an agreement to renew broadcast TV’s most-watched series for its 11th and 12th seasons, taking it through the 2018-19 season.

Stars Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg and Kunal Nayyar are all set to return. Their co-stars Mayim Bialik and Melissa Rauch — who have been engaged in prolonged contract negotiations — have not yet signed new contracts, according to Deadline.com, though they are reportedly close to doing so.

The renewal comes on the heels of word that CBS is picking up the “Big Bang” prequel series “Young Sheldon,” likely to premiere alongside the flagship series next season. The spinoff stars Iain Armitage (“Big Little Lies”) as a 9-year-old version of Sheldon Cooper (Parsons) growing up in Texas.