Seth and Ryan help Caleb celebrate in Las Vegas, while Kristen reluctantly plans a bachelorette party for Julie. Marissa learns something about Teresa that could have consequences.
When Walter is accidentally launched into space in a rocket, he hallucinates about Paige as his oxygen runs low, and Team Scorpion works feverishly to find a way to bring him home before he suffocates.
The truth behind Fitz's turn threatens to bring down all of S.H.I.E.L.D.