A true American will never give in to "Alien Commies From The Future!" When the Zephyr arrives in New Mexico in the year 1955, the team quickly realizes they will have to infiltrate Area 51, which is of course a SHIELD base. Coulson and Simmons pick the perfect disguise and try to weed out imposters. The only problem is that they can't fool the highly skilled agent, and friend of Peggy Carter, Daniel Sousa. The rest of the team tries to get information from an abducted (and racist) government worker. May's condition appears to be getting worse when an anxiety attack allows a Chronicom to get away. And Yo-Yo still has no speed. Jay and Josh discuss turtles in the desert on this week's Agents of S.H.I.E.L.D.: Case Files.