![Big Bang Theory' Series Finale: 7 Secrets to Know Before Watching the Last Episode! (Exclusive) | Entertainment Tonight Big Bang Theory' Series Finale: 7 Secrets to Know Before Watching the Last Episode! (Exclusive) | Entertainment Tonight](https://www.etonline.com/sites/default/files/images/2019-05/tbbt_tfs_studioboard_f_v2sim_c.jpg)
Big Bang Theory' Series Finale: 7 Secrets to Know Before Watching the Last Episode! (Exclusive) | Entertainment Tonight
![The Big Bang Theory: Leonard and Penny related scoop on the season 8 finale (Episode 8x24 "The Commitment Determination") from TVLine's Matt Webb Mitovich The Big Bang Theory: Leonard and Penny related scoop on the season 8 finale (Episode 8x24 "The Commitment Determination") from TVLine's Matt Webb Mitovich](http://d.ibtimes.co.uk/en/full/1435208/big-bang-theory-season-8-finale.jpg?w=736)
The Big Bang Theory: Leonard and Penny related scoop on the season 8 finale (Episode 8x24 "The Commitment Determination") from TVLine's Matt Webb Mitovich
![Here's what happened in The Big Bang Theory's bittersweet finale that fans are praising as "perfect" Here's what happened in The Big Bang Theory's bittersweet finale that fans are praising as "perfect"](https://hips.hearstapps.com/hmg-prod/images/big-bang-theory-finale-3-jpg-1558056196.jpg)