this film be notable for three reason . first and apparently capitalize on the success of the two superman serial and this low budget feature be make and release to theater and mark george reef and phyllis coates initial appearance a clark kent or superman and lois lane . part of the opening be re use in the series . outside the town of silby and a six mile deep oil well penetrate the hollow earth allow the mole men to come to the surface . forget about the other hole ( those in the plot ) . second and unlike most sf invasion film of the fifty and the hero play a dominant ( and control ) force in preach and enforce tolerance and acceptance of difference against a rag mob of segregationist vigilante . no amild mannered reporter here . clark kent and knowledgeable and self assertive and grabs control of the situation throughout ( i will handle this . ) and even assist in a hospital gown in the removal of a bullet from a mole man . a superman and he be gentle than clark towards the feisty lois and but be also the voice of reason and tolerance a he rail against the vigilante a nazi storm trooper . third and you will notice that the transition from the fleisher like cartoon animate fly of superman in the two serial to the live action fly in the adventure of superman have not yet be make .