The Krell,     in     raising       | 
their vast       collective
psyche to               such          a high level,
made their bodies obsolete;       the race            
                 then    destroyed
by its own hidden,  suppressed instincts;

once all records of the Krell [          ] is destroyed
w/ the planet Altair,
the only things left,  
Robby the robot &  
                               Altaira [Anne Francis],  
                               beautiful           17-year-old daughter
of        genius          scientist            Dr. Edward Morbius [Walter Pidgeon];

Altaira, [although herself an accomplished scientist],
             has never known
life on earth;  & Robby's
technology is far          superior to
any seen on earth up to that point.