- "He wasn't. I know you didn't mean to, but you must have really broken his heart. Now he knows what that feels like, and he is applying that data to someone else. Ralph may not be changing, but Walter certainly is."
- —Toby to Paige
"'Monkey See, Monkey Poo" is the nineteenth episode of the third season of Scorpion and the sixty fifth of the series overall. It aired March 13, 2017.
To stop a dangerous virus from spreading, Team Scorpion must locate a rare endangered monkey in the Amazon that has the antibody for the cure. Also, Toby and Happy see a counselor to prepare for matrimony.
- 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