On Scorpion Season 3 Episode 5, Walter takes a job at the Los Angeles Museum of Science and History. The job needs to be at night because Walter's equipment requires that the security cameras be turned off. 

It turns out, the mission was a trap. Bad guys created a problem that they knew would require scientists to come to the museum at night. The bad guys are after Tantalum, which is found in a meteorite in the museum.

Meanwhile, Toby is adjusting to life as a father-to-be. Basically, he is feeling sympathy pains and trying to keep Happy fed and warm, even when she wants to be left alone. He's not the only one looking out for Happy's child. Walter tells Happy he will do whatever it takes to protect her family.

Once Team Scorpion figures out what is going on, they have to get a message to Toby and Paige, who are back at the garage. Thankfully, there's a falcon named Reginald who is pretty good at delivering messages.

In the end, Team Scorpion saves the day, and there is only a couple million dollars in damages to the museum. Everything is going well until the lady from US Citizenship and Immigration shows up. Now, Team Scorpion has to convince her that Happy and Walter are happily married, and Toby's idea is to make them live together for a while. This will be fun.