"The Big Bang Theory" season 10 episode 15 features Johnny Galecki's Leonard and Simon Helberg's Howard plotting against Jim Parson's role as Sheldon.

The upcoming episode titled "The Locomotion Reverberation" will see Leonard and Howard realizing that Sheldon is the reason why the progress of their invention is slowing down. And because of this issue, the two have decided to distract him from the project.

According to Yahoo, they will do this by telling him that he is in charge of engineering and must be the one responsible for locomotive. Without knowing the plan of Leonard and Howard, Sheldon is innocently happy with his new task. In fact, he became more motivated in finishing the invention as soon as they can.Unfortunately, an unexpected thing will happen that might result to refraining three of them in continuing the invention.

It is also reported that Bernadette (Melissa Rauch) will finally get the chance to hang out with her friends. Ever since she gave birth to her child Halley, Bernadette has been nothing but a hands-on mother. With the help and support of her other half Howard, she just usually stays at home.

Now, Amy (Mayim Bialik) and Penny (Kaley Cuoco) is set to ask her to party in episode 15. Despite having a busy husband due to the said invention, significant people will take over to look after Halley. Raj (Kunal Nayyar) and Stuart (Kevin Sussman) is the people who will take care of baby girl while mommy joins the girl's night out. As per Spoilers Guide, here is episode 15's official synopsis:

"Leonard and Wolowitz try to distract Sheldon when he slows the progress of their guidance system. Also, Penny and Amy take Bernadette out for the night, leaving Raj and Stuart to care for baby Halley."

In addition, season 10 episode 15 will be penned by Chuck Lorre, Jim Reynolds and Steven Holland. Also, Mark Cendrowski will serve as the director. Along with Sussman, other guest stars are expected to appear namely, Dean Norris (Colonel Williams) and Pamela Adlon (Halley, O.S).

Meanwhile, there are lots of things fans must watch out for as season 10 is consists of 24 episodes. The series finale will be aired around May but its home network has not announced yet if the series is renewed for season 11. Furthermore, watch "The Big Bang Theory" season 10 episode 15 on Feb. 9, 2017.