Twelve seasons and these Big Bang Theory storylines were never followed up. Our countdown includes the app, Penny blossoms, the girl upstairs, and more! Which Big Bang Theory storyline do YOU want resolved? Let us know in the comments!

Watch more great Big Bang Theory videos here:
The Most Rewatched Big Bang Theory Moment of Every Season - https://youtu.be/efNeBnlUEYo
Top 10 Most Romantic The Big Bang Theory Moments - https://youtu.be/J6hRnb0p2wo
Top 10 Penny & Sheldon Moments on The Big Bang Theory - https://youtu.be/UxdAW0Oyl5I

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