Editor
A mad scientist, Dr. Aranya (Jackie Coogan), has created giant spiders in his Mexican lab in Zarpa Mesa to create a race of superwomen by injecting spiders with human pituitary growth hormones. Women develop miraculous regenerative powers, but men mutate into disfigured dwarves. Spiders grow to human size and intelligence.
Editor
A letter from Jane, who is nursing British troops, asks Tarzan's help in obtaining a malaria serum extractable from jungle plants. Tarzan and Boy set out across the desert looking for the plants. Along the way they befriend a stranded American lady magician.
Editor
Bob Randall, temporarily in command of the Coast Guard vessel Niobe, expects a promotion and the captaincy of his ship. Instead, he is replaced by Lieutenant Mays, son of the area commander. Mays is afflicted with a fear of the sea, although he has served well in Coast Guard aviation. His father, however, thinks Mays can overcome his fear by taking command of the Niobe. When seal poachers kidnap Bob Randall's girlfriend Connie, Bob and Mays disagree about the proper means of rescuing her and capturing the seal poachers. When Mays's inexperience and phobia foil their attempts at rescue, Bob comes up with his own plan.
