i haven not see the first two only this one which be call primal specie in england . i do not think i will be bother to look them out though . this be an awful film . terrible acting and bad dialogue and cheap rubber monster . everything about it be so nasty . the most sympathetic character die really quickly and leave you with the annoy one and especially one call polchak and who be an incredible jerk . no one like that would survive 5 minute in the army . he last for age but i be pleased when he finally get his head get chew off i be have nightmare he be go to survive . the colonel be rubbish too all moody pout and clueless shouting . and the specky doctor look and act like she be out of a porno . i be wait for her to take her glass off and shake her hair and turn into a vamp and but she do not . pity that and a it would have liven the film up no end . didn not roger corman use to make half decent film once .