Fans of  Sheldon Copper (Jim Parson), brace yourself as Big Bang Theory season 10 will have big twists and new cast members.

Apparently, there will be some fallouts following the previous season finale in which Sheldon’s mother, Mary Cooper (Laurie Metcalf), and Leonard’s dad, Alfred Hofstadter (Judd Hirsch), seem to hook up. The two left the dinner, which was prepared the night before Penny (Kaley Cuoco) and Leonard (Johnny Galecki) tied the knot for the second time.

Executive producer Steve Molaro has teased that Penny and Leonard’s renewal of vow might not happen because of what happen at the dinner.  “We’re left with a good amount of tension between all the parents. There’s a lot of fallout the following morning before we even get to the ceremony, if we even do,” he told Entertainment Weekly.

What could be the possible reason of the tension in Big Bang Theory season 10?

Molaro hinted that the fallout could be between Sheldon and Leonard. If Alfred and Mary’s relationship will go smoothly, the two Caltech scientists could end up as brothers. When asked about Sheldon and Leonard becoming brothers, Molaro said the two will be “uncomfortable” with the idea of their parents hooking up. He said this is where the next season of Big Bang Theory pick up.

With regards to new cast members, definitely it will not be Bernadette Rostenkowski (Melissa Rauch) and Howard Wolowitz (Simon Helberg) baby. Molaro earlier said Bernadette will be pregnant for the whole duration of season 10. Hence, we will be meeting their new bunch of joy at the finale of the upcoming season.

Leonard’s dad and Howard’s dad could also appear in season 10 since Sheldon’s mom and Leonard’s dad are already in the picture. There were also speculations that Penny’s mom will also appear in the 10th season.

There is a big chance that Penny’s mother will also show up since she is getting married. Viewers have already seen Penny’s dad in the previous season.

Big Bang Theory season 10 will premiere on September 19.