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.

Making new friends can't be that difficult, or can it? Sheldon embarks on a mission to win over Kripke.

Penny is close to eviction and takes on a generous loan from Sheldon. He is unconcerned but she is raked with guilt.

Sheldon's equilibrium is shaken when chaos strikes in the form of Penny and a paintball gun.

Sheldon is forced to allow Penny one-time access to his bedroom while Raj & Howard compete over a Terminator.

Penny starts a business and takes on Sheldon as business partner, when he points out the financial flaws in her plan.

The guys take Howard to Vegas to mend a broken heart leaving Penny to take in Sheldon, who has nowhere to stay the night.

Howard and Raj go in search of sexy Goth chicks, while Sheldon tries to train Penny.

Sheldon comes to Penny's rescue. He dresses her and learns to drive all in one day.

Penny feels left out when Bernadette can talk physics with Leonard and asks Sheldon to give her lessons.

Sheldon finds himself with a date after Raj asks him to be his wingman at a graduate mixer.

Sheldon comes to Penny's rescue. He dresses her and learns to drive all in one day.

The gang try to help Sheldon overcome his fear of public speaking so he can collect the Chancellor’s Award for Science.

Pennys invites Sheldon to dinner but keeping this date and not breaking the 'Bro Code' is not quite that simple.

When Sheldon's students are less than impressed by his class, Penny the "Actress" suggests lessons might help.

There's a threat to Los Robles Ave and Sheldon is determined to convince Penny to throw away the infectious 'Chair of Death'.