'The Big Bang Theory' season 9 spoilers: Sheldon's birthday focus of 200th episode

by Herleen Sabillano, |

Award-winning CBS comedy "The Big Bang Theory" will celebrate its 200th episode this Thursday, Feb. 25.

Season 9 episode 17 titled "The Celebration Experimentation" revolves around Sheldon Cooper's (Jim Parsons) birthday. In the episode, Sheldon gets an overwhelming surprise. According to Entertainment Weekly, Adam West, Sheldon and the gang's hero, is set to be one of the guest stars of the episode. 

FACEBOOK/THE BIG BANG THEORY

West is known for his Batman role on ABC's TV series from 1966 to 1968 and the film in 1966. 

Other guests who are set to make an apperance in the next episode are Barry Kripke (John Ross Bowie), a man who Sheldon and Leonard Hofstadter (Johnny Galecki) dislikes; Dr. Beverly Hofstadter (Christine Baranski), mother of Leonard; Leslie Winkle (Sara Gilbert), Leonard's ex-girlfriend; and Wil Wheaton as himself.

Fans of the show are excited to know more about what will happen the rest of the season, with Bernadette Rostenkowski-Wolowitz's (Melissa Rauch) announcement that she and Howard are expecting a baby. The waitress-turned-mircrobiologist, who initially didn't want any children, told Howard the news after saving their pet rabbit Valentino in the Valentine's Day episode. 

The Hollywood Reporter reported some details from Steve Molaro, the show's producer and writer, about the pregnancy. Although the idea was there, he said that it wasn't in any of their plans to write about it. He said that it seemed fitting when Bernadette was holding their pet rabbit and naming it. 

Molaro recalled: "Half-kidding, I said, 'What if Bernadette tells the rabbit, "We'll find another time to tell him I'm pregnant."' The room had such a strong, positive reaction to it. We thought it seemed like an organic moment and we decided to put it in."

Meanwhile, the cast celebrated the 200th episode off-air on Saturday, Feb. 20, with a red carpet, cakes, and pictures that they shared in Instagram with the hashtag, #tbbt200. "The Big Bag Theory's" official Instagram account posted a video of the cast and creators cutting the cake. 

"The Big Bang Theory's" 200th episode "The Celebration Experimentation" airs on CBS on Thursday, Feb. 25.