'The Big Bang Theory' Season 10 Spoiler: Theories Revealed! Sheldon and Leonard Become Stepbrothers? Cast Going To Change?

"The Big Bang Theory" Season 10 might see a few major changes. Above all, Sheldon's and Leonard's relationship might see a drastic change. Will it be hilarious if they actually become step brothers?

"The Big Bang Theory" Season 9 ended with a big bang! It is possible that at the end of the episode, Leonard's father and Sheldon's mother have hooked up. That plot line will see an interesting twist of tales.

It was also revealed that in "The Big Bang Theory" Season 10, both Leonard's and Penny's families feel that their wedding was an embarrassment to them.

'The Big Bang Theory' Season 10: Sheldon and Leonard - Stepbrothers!

Could "The Big Bang Theory" Season 10 see another love story brewing? In the finale of Season 9, during the of Leonard and Penny, Leonard's father and Sheldon's mother both hated Leonard's mother. This common enemy could actually bring them close together!

It is seen in the finale that the two got so well acquainted that they decide to take a hike to their hotel rooms. Well, we really don't know what might happen next. Do we?

Penny's reaction when Leonard and Sheldon find their parents not answering their phones in "The Big Band Theory" Season 9 finale has left the fans speculating.

Since the parents of the bride and the groom shared the same hotel, it is possible that "The Big Bang Theory" Season 10 will see another romance bloom.

The Executive Producer of the show, Steve Molaro did reveal that there is something 'going on' between Alfred and Mary and Sheldon and Leonard tries their best to stop them.

'The Big Bang Theory' Season 10: More Spoilers!

Is Lisa Kudrow from "FRIENDS" going to portray the role of Penny's mother? This theory is often speculated and the theory is making rounds from a really long time. Finally, Season 10 will reveal who actually is going to portray the role, reported Ecumenical News.

Is "The Big Bang Theory" Season 10, the last installment of the series? There are rumors that the next season of "The Big Bang Theory" is going to be the last. However, there are no reports on the same, reported Chat Sports Net.

As for Howard and Bernadette, Sheldon and Amy), they are set to take their relationship to reach new milestones. Raj's new girlfriend remains mysterious!

"The Big Bang Theory" Season 10 will air on September 19, 2016.