The Big Bang Theory Season 8
The Big Bang Theory Season 8 posterCBS

The Big Bang Theory Season 8 episode 6 airs today, Monday, 20th October at 8:00 pm ET on CBS.

The 6th episode is titled, The Expedition Approximation, where Sheldon and Raj see if they can survive intense heat when they venture deep underground in the name of science.

The official synopsis reads:

Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel. Meanwhile, Leonard and Penny seek advice from Wolowitz and Bernadette after they fight about money.

Click here to watch the episode live stream online.

Click here to watch the episode online.

In the first sneak-peek, everyone talks about Penny's new job, and Sheldon shares a snippet about his new field of study, dark-matter.

In the second sneak-peek Raj warns Sheldon about the repercussions of a research expedition in a salt mine by simulating the conditions in a steam tunnel.

Watch the 30 seconds promo here.