The Big Bang Theory Spoilers Season 11 Episode 5: Sheldon Revisited

The Big Bang Theory returns Monday on CBS for season 11, episode 5 with another Sheldon (Jim Parsons) conundrum.

This time it’s not why this typically out-of-synch character is so, well, complicated–among other wonky traits. Instead, it’s more like what happened to all of Sheldon’s most blatant quirks, many of which have long been socially unacceptable?

Surprise! Penny (Kaley Cuoco) may have found the answer in a book addressing all questions about this seemingly-sheltered nerd.

In fact, his astute friend states that she has unearthed “the answer key to the Sheldon test” in a new The Big Bang Theory promo.

Meanwhile, CBS describes the The Collaboration Contamination episode like this:

“Sheldon and Koothrappali (Kunal Nayyar) confide in Bernadette (Melissa Rauch) when they can’t handle Amy (Mayim Bialik) and Wolowitz (Simon Helberg) working together.”

Sounds like an episode to remember. Ready to watch? We are. The Big Bang Theory airs Mondays at 8 p.m., ET. on CBS.