'The Big Bang Theory' Season 8, Episode 21 Spoilers & Synopsis: 'The Communication Deterioration' (S08E21) Sees Penny Auditioning For Kevin Smith's 'Clerks 3' [VIDEO]

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The Big Bang Theory season 8
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"The Big Bang Theory" is nearing the end of its 8th season on CBS, but luckily the show hasn't lost any momentum! Tonight's episode, "The Fortification Implementation" (S08E20), will bring plenty of laughs. Next week, the show will be back with another all-new episode called "Communication Deterioration," which is Episode 21 of Season 8. The consistently hilarious series will air again next Thursday at 8 PM ET/PT, as we witness Penny returning to the acting world as she apparently auditions for a role in Kevin Smith's 'Clerks 3.' Care for some more spoilers? Keep reading for a full "Communication Deterioration" (S08E21) synopsis and more!

After tonight's "The Fortification Implementation," Episode 20 of Season 8, airs on CBS, fans will likely be counting down the days until next Thursday at 8 PM. But before we jump into some exciting spoilers for Episode 21, let's take a moment to quickly remind ourselves of what to expect tonight!

According to CBS, "When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship," explains the Episode 20 synopsis.

"Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton's podcast, she and Leonard have a huge, on-air argument, on THE BIG BANG THEORY, Thursday, April 9 (8:00-8:31 PM, ET/PT), on the CBS Television Network," concludes the CBS synopsis.

The CBS press release notes that Kevin Smith, Matt Bennett and Wil Wheaton will all guest star in tonight's episode.

For a preview of what's to come, check out the promo video for "The Fortification Implementation" below:

Need another sneak-peek? Watch these two awesome sneak-peek videos for Episode 20 now!

Excited yet? Well, we've got even more spoilers for you.

On next week's episode, "Communication Deterioration" (S08E21), there's plenty more fun in store for viewers!

According to an official CBS press release, in Episode 21, "When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do."

"Also, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job, on THE BIG BANG THEORY, Thursday, April 16 (8:00-8:31 PM, ET/PT), on the CBS Television Network," concludes the spoiler-filled synopsis.

The "Big Bang Theory" wiki website provides an additional episode summary, explaining "The guys split up into teams to work on a project to communicate with aliens, while Penny considers auditioning for the movie 'Clerks 3'."

As you can see from the Episode 20 and 21 synopses, Kevin Smith and "Clerks 3" seem to be a recurring theme - meaning Penny's acting audition will be a storyline that runs through both episodes!

Ready for two awesome weeks of "The Big Bang Theory" on CBS?

Don't forget to tune in at 8 PM tonight to watch "The Fortification Implementation" (S08E20), and then next Thursday (April 16) to see "Communication Deterioration" (S08E21)!

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