Big Bang Theory season 9
Sheldon and Amy in Big Bang Theory season 9 episode 11 promotional pictures CBS

The Big Bang Theory season 9 returns with its fall finale episode on 17 December, which will feature the much awaited coitus between Sheldon Cooper and Amy Farrah Fowler. Episode 11 is titled, The Opening Night Excitation, which airs this Thursday at 8pm EST on CBS.

Actor Bob Newhart will reprise his Emmy winning role as Arthur Jeffries aka professor Proton in the episode. According to Variety, "Arthur returns as a ghostly Jedi in Sheldon's dreams to help him sort out his feelings and make a very important decision."

The official synopsis reads as follows:

After more than five years of dating, Sheldon and Amy spend their first night together. Also, Leonard, Wolowitz, and Koothrappali must decide who will take their extra Star Wars movie ticket, on The Big Bang Theory.

Click here to watch the episode via live stream online on CBS All Access or click here to watch it online (only in the US).

The first sneak peek released by CBS shows Leonard, Rajesh and Howard leaving for the Star Wars: The Force Awakens premiere as Leonard says, "The wait is finally over." Penny and Bernadatte ask the boys to have fun as Raj points out, "Can't believe Sheldon gave this up."

Another promo shows Sheldon in Amy's apartment as she's lighting candles and awkwardly asks, " So... what you have in mind for tonight?" Sheldon replies, "I thought I could take you out to a nice birthday dinner. If we pick a place east of here, we might find balloons."

Amy says, "That sounds nice, but I am not really hungry right now. I thought maybe we could do presents first." Sheldon agrees and says, "I should probably tell you something about this gift..." but Amy cuts him off and says, "You mean before you give it to me?"

In the promo, Sheldon says, "May I ask you a question before I 'give it to you'?" Then he confusedly asks her, "Why are we saying, 'give it to you' like that?"