The Staircase Implementation
Leonard tells Penny about how he met Sheldon for the first time…and what happened to the elevator.
The Plimpton Stimulation
Leonard and Sheldon compete for the attention of a famous female physicist.
The Spaghetti Catalyst
When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.
The Wheaton Recurrence
A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
The Pants Alternative
Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
The Precious Fragmentation
When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
The Excelsior Acquisition
Sheldon winds up in traffic court when he gets a ticket because of Penny.
The Hofstadter Isotope
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
The Dead Hooker Juxtaposition
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
The Lizard-Spock Expansion
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.