The stakes are high in Season 3 of “Scorpion” as the team must immediately put their personal problems aside and focus on stopping hackers from carrying out a nuclear attack. While Happy (Jadyn Wong) opens up to Toby about her husband's true identity before making a commitment, Walter (Elyes Gabel) almost ruins things with Paige (Katharine McPhee) forever until Paige's mother, Veronica (Lea Thompson), arrives and helps him take on Tim (Scott Porter). Meanwhile, Sylvester (Ari Stidham) runs to be the town alderman, but his germaphobia gets in the way, that is, until Cabe's (Robert Patrick) new relationship presents them with an opportunity. Elsewhere, Walter becomes an accidental astronaut when a storm interferes with his experiments. Also, the whole team find their lives in jeopardy as they travel to a new job. Guest starring Penn Jillette.