John Hartman

In the season three premiere, Mary (Zoe Perry) worries about Sheldon's mental health, after Dr. Sturgis experiences a nervous breakdown.

After choking on a breakfast sausage Sheldon wrestles with his fear of solid foods and discovers comic books for the first time.

A disappointing loss at the science fair sends Sheldon’s life in a new direction. JASON ALEXANDER guest stars as Sheldon’s drama teacher Mr. Lundy.

Team Scorpion visits a renaissance festival, but the revelry is cut short when a group tries to rob a nearby police evidence locker; Paige grows weary of Walter pointing out the historical inaccuracies at the festival.

On Election Day, as democracy hangs in the balance, Team Scorpion is called on when someone tries to throw the U.S. presidential election into chaos.

Paige's estranged mother calls on Team Scorpion when she accidentally uncovers a forgotten nuclear reactor on the verge of exploding.