"The Big Bang Theory" Season 10 upcoming episode 15 will see Johnny Galecki's Leonard and Simon Helber's Howard work together against Jim Parson's Sheldon to keep him away from their latest project. Meanwhile, the possibility of a Season 11 for the show is still blurry.

"The Big Bang Theory" Season 10 Spoilers

Episode 15, titled "The Locomotion Reverberation," has Leonard and Howard blaming Sheldon for the slow progress of their invention, Travelers Today reported. To keep him away from their project, Leonard and Howard tricked Sheldon into believing that he is in charge of locomotive, which he is happy to oblige.

Now, Sheldon is more motivated than ever to finish the invention faster. However, unexpected events happen stopping the three from ever finishing their invention. Fans can only watch the latest episode to know what this unfortunate event is.

Meanwhile, Melissa Rauch's Bernadette will finally be reunited with her friends after giving birth to her daughter Halley. With Howard's support, she stays at home to be a full time hands-on mother to their child. In episode 15, she is expected to party with Kaley Cuoco's Penny and Mayim Bialik's Amy, who invited her to have some fun.

Now, Kunal Nayyar' Raj andKevin Sussman's Stuart will assigned to take care of Halley. It seems like Bernadette will be partying while her husband is busy with the invention in the upcoming episode. The new episode is written by Steven Holland, Jim Reynolds, and Chuck Lorre with Mark Cendrowski as the director.

"The Big Bang Theory" Season 11 Remains Blur

Season 10 of "The Big Bang Theory" will have 24 episodes with its finale airing some time in May. However, there is still no official news if CBS TV will approve a Season 11 for the series, Yahoo reported. Parsons, Cuoco, and Galecki are still negotiating with the studio to possibly renew "The Big Bang Theory" for a season 11.