The Big Bang Theory Season 10 is not premiered yet but speculations on plotlines might hint on more troubles for the gang.

The Big Bang Theory season 10 spoilers: Sheldon and Leonard to become step brothers?

The Big Bang Theory season 9 ends with Sheldon (Jim Parsons) and Leonard (Johnny Galecki) parents going back to hotel earlier together after family dinner. Both parents have learned that they stay in the same hotel Leonard seems to be worried that they might be hooking up. The next day, Sheldon and Leonard try to call their parents but their phones are off. Penny (Kaley Cuoco) has this thought that Sheldon and Leonard's parents could spend the night together.

Hence, in TBBT season 10, fans expect to find out if Sheldon's fear of his mother having a great night with Leonard's father, might be true, MovieNewsGuide reported.

The Big Bang Theory season 10 spoiler: Howard and Bernadette are expecting a baby

As the couple is expecting a baby girl (or baby boy), fans can expect Bernadette's (Melissa Raunch) chaotic hospital scene in TBBT season 10 as she will give birth to her baby. Howard (Simon Helberg) might think of getting a job to finance his family. He could be taking an offer from the government to work in technology industry.

Reached out for comments, TBBT Executive Producer Steve Molaro, said that there might be changes after Sheldon and Amy (Mayim Bialik) had sex and Howard is going to be a father. However, Molaro explained that there could be a few scenes where Howard will not be with the babies when Bernadette's parents are watching over the baby, Entertainment Weekly wrote.

The new baby born might also have an impact to Rajesh (Kunal Nayyar) and Howard friendship since both are great pals.

The Big Bang Theory season 10 release date

TBBT season 10 premiere date is on September 19.

Do you think Sheldon and Leonad will become step brothers as their parents hook up? What other Big Bang Theory season 10 spoilers you've heard of?

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