On Scorpion Season 3 Episode 4, Ralph's class goes on a field trip, and one of Ralph's classmates wanders off. His name is Daniel, and he has nonverbal autism. Daniel communicates via his tablet.

A dead drop goes wrong, and it Daniel's tablet is grabbed by mistake. This leads Daniel to grab the bad guy's tablet. When Daniel realizes that he is being followed, he runs.

Cabe figures out that the bad guys are members of an international mercenary ring called S6. He takes Happy to find out more about what S6 is up to while the rest of the team tries to figure out where Daniel is with help from Daniel's mom, Jill.

Team Scorpion saves Daniel's life, but S6 is still out there. Thankfully, Daniel uncovered some crucial information on S6's tablet. Cabe and Happy head out and manage to stop the attack be

Meanwhile, Toby goes to his nemesis for answers. Collins once told Toby that Happy wouldn't accept his proposal, so Toby goes to find out what Collins knows. What he gets is a riddle, which is driving Toby crazy.

However, Toby finally cracks the riddle, and he discovers that Happy's husband is none other than Walter. That's right, Happy married Walter, so he could get a green card, and she can't divorce him because that would get him deported.

Walter gets his citizenship in 2 years, but Happy can't wait that long because she's pregnant.