For anyone hoping to tune into tonight’s episode of The Big Bang Theory completely unaware of what to expect consider this your SPOILER ALERT warning.

‘The Big Bang Theory’ End-Of-Year Finale Preview: SPOILER ALERT

After five years of dating, a break and a make up, Sheldon (Jim Parsons) and Amy (Mayim Bialik) are finally consummating their relationship in tonight’s episode, “The Opening Night Excitation.”

When asked by Entertainment Tonight what he thought of the plot development, Parsons joked: “Putting the ‘bang’ into the theory, I guess.”

“I was very surprised,” Parsons admitted. “But then I read it, and it seemed absolutely the right time.”

Malik feared the moment would come across “voyeuristic or kind of icky” but was happy to report this was not the case. “It’s very tender. It’s very sweet,” she said of the intimate scene.

In the episode Sheldon faces a dilemma when the opening night of Star Wars: The Force Awakens coincides with Amy’s birthday. Sheldon initially doesn’t think there’d be a problem with him choosing the big premiere over his girlfriend but Penny (Kaley Cuoco) and Leonard (Johnny Galecki) manage to knock some sense into him.

Lucky they do because it’s this grand gesture that gets the two virgin lovebirds in the mood.

The Big Bang Theory airs Thursdays at 8 p.m. ET/PT on CBS.

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