The Enterprise encounters a vast alien ship that threatens the Enterprise with destruction.
Quest roles:
Frank da Vinci(Lt. Clifford Brent), Eddie Paskey(Lieutenant Leslie (uncredited)), Ron Veto(Harrison), Ted Cassidy(Gorn (voice)), Clint Howard(Balok), John Gabriel(Crewman (uncredited)), Vic Perrin(Tharn), Walker Edmiston(Provider #2), Bruce Mars(Finnegan), Sean Morgan(Crewman), Anthony D. Call(Dave Bailey), Jeannie Malone(Yeoman)