[s10e1] The Conjugal Conjecture Today

: The episode marks the first appearance of Penny's mother, Susan (played by Katey Sagal), and her brother, Randall (Jack McBrayer). Susan is highly anxious that their family will be seen as "white trash" due to Randall's history of manufacturing and selling meth.

: A subplot begins involving Howard being tracked down by Colonel Williams (Dean Norris) from the Air Force, who is interested in the quantum gyroscope he, Leonard, and Sheldon invented.

The episode was a massive ratings hit, viewed by over during its original broadcast.