Double Take (S05E12)

It’s Invasion of the Body Snatchers, Eureka-style. The Smart Dust control unit is still on the fritz and wreaking havoc on the town’s communications systems. Worse, the bio-printer has gone missing, Holly (Felicia Day) is definitely not herself, and Astraeus crewmembers are mysteriously disappearing at the hands of Carter and Deputy Andy. (iTunes)