: Amy Farrah Fowler initially feels threatened by Alex's presence, but the tension shifts to Penny when it becomes clear Alex is actually interested in Leonard.
: Sheldon hires a graduate student named Alex Jensen to perform the menial task of reviewing his early work. [S6E3] The Higgs Boson Observation
In this episode, Sheldon Cooper is inspired by the recent Discovery of the Higgs Boson to review his own childhood journals, hoping he previously documented a Nobel-worthy idea. : Amy Farrah Fowler initially feels threatened by
The Higgs Boson Observation - The Big Bang Theory - Apple TV [S6E3] The Higgs Boson Observation