When Sheldon is fired, he has time to pursue madcap ideas, annoy Penny and mingle with the ordinary people.

It's battle of the nerds, as the two physicists go head to head over a research paper.

No sponge baths or enemas are the ground rules when Sheldon demands some intimate home care from Penny.

Sheldon is the youngest recipient of the prestigious Stevenson Award. Well he was...

Sheldon teaches Penny how to play World of Warcraft and unleashes a monster.

After Leonard takes on night shifts, the gang decide it's time for Sheldon to learn to drive.

Sheldon attracts a groupie and unwittingly finds himself in a relationship of the mind.

Sheldon meets his match when Penny won't "Knuckle under!" and a tantalizing tussle ensues.

Sheldon is thrilled when Leonard starts dating a doctor and tries to keep them together.

Believing he has mastered the art of gift giving, Sheldon is floored by Penny's perfect gift.