Guest Stars Steven Culp as Major J. Hayes Thomas Kopache as The Alien (Test subject) Noa Tishby as Amanda Cole Uncredited Evan English as Ensign Tanner Solomon Burke Jr. as Ensign Billy (Starfleet) Duncan K. Fraser as Ensign Walsh Henry Farnam as Command Division Crewman (Crewman (2154-2161)) Hilde Garcia as Crewman Rossi Adam Anello as Operations Division Crewman (Engineer / Steward)