"Sun of a Gun" is the fourteenth episode of the second season of Scorpion, and the thirty sixth of the series overall. It aired on January 18, 2016.
Sylvester comes face to face with his estranged father, a retired general, who asks Team Scorpion for help when he believes that a dictator in Africa has uncovered a deadly World War II-era weapon of mass destruction and intends to use it.
- Elyes Gabel as Walter O'Brien
- Katharine McPhee as Paige Dineen
- Robert Patrick as Cabe Gallo
- Eddie Kaye Thomas as Toby Curtis
- Jadyn Wong as Happy Quinn
- Ari Stidham as Sylvester Dodd
- The episode title references the "Sun Gun" in the episode, as well as the phrase "Son of a gun!" which is commonly used in the place of another expletive.