While working on a device to transmit objects by radio waves, Myles accidentally transports himself to Venus. He is captured by the dictatorial ant-men who control the planet, but eventually helps win the freedom for the human slaves and wins the hand of Princess Lilla.; Professor Chalmers has invented a device that allows him to view the past. He uses it to show his colleague a conflict between ancient civilizations from 100,000 years earlier.; Wealthy Wagner Duprey hires Chet to guide him and his niece through the dangerous Venusian jungle. Winged people, hostile to earthmen, capture the expedition. Thirty years ago, an earthman had stolen a sacred jewel eye of Anacinth, god of the winged people. That earthman was Wagner Duprey, whose real goal for the new expedition was to steal the other jewel eye to restore his squandered wealth. He dies in the attempt, but Chet and Magda escape.; Captain Science and Rip go back in time to stop a threat in the present from another dimension.; Captain Science stops a threat in the future to conquer modern-day Earth from the dark and icy planet Pluto.; Avenger and Teena book passage on the Star Queen when they learn that it is the next target of the space pirate Maag.; An alien race called the Flann is attacking Titan, taking uranium and human slaves. Kenton is assigned to Titan, posing as a convict in the mines. When the Flann attack, Kenton stows away on the alien ship and learns how to destroy the Flann before they can attack Earth.; Myrza orders the invasion of Earth's solar system to take humans to feed the life dynamos used by her race. Kenton is taken prisoner, but manages to rig an ultra-violet ray lamp that melts the jewels that protect the invaders from their own sleep rays. Without their jewels, the life force does not function and Myrza and her invaders die.; The space sirens are women whose songs incapacitate their victims so that the victims' spaceships can be hijacked and the crews and passengers enslaved. Reporter Maeve Malloy is aboard the spaceship Yonkers when it is attacked by space sirens, but she manages to get a distress call out to Kenton before she is overcome.; The Lanning expedition is camped at the base of Quhaltec Mountain deep in the South American jungle when a strange storm rouses the natives. They kill Jack and throw Ross into the crater to satisfy their gods. But the sloping walls of the crater allow Ross to survive the fall. Exploring the bottom of the crater in an attempt to escape, Ross stumbles on a hidden cavern of sleeping alien beings. He feels compelled to pull a lever which awakens the alien beings.; Ross leaves the alien cavern, but mosquitoes cause him to catch jungle fever and his return to civilization is delayed. Meanwhile, numerous sightings of flying saucers are reported. When Ross returns, the press reports catch the attention of the F.B.I. and foreign agents. Foreign agents capture Ross and try to torture him for information, but the aliens break in and kill his tormentors.; Communicating telepathically with the aliens, Ross learns that the aliens once inhabited Earth, but a test of an advanced atomic weapon wiped out all life on the planet except for twelve alien beings who went into suspended animation in the underground Quhaltec cavern. They had been waiting for the day when life would evolve so that someone would find them and awaken them, which Ross had done. The aliens provide Ross damper ray boxes to be planted around to world to prevent the atomic blasts that ended their civilization, then leave another galaxy.; While archaeologist Tayne is examining a carved crystal, a cut on his hand accidentally activates the crystal and transports him to a strange world. There he is welcomed as a savior since legends indicate that a stranger will appear to save them from Rogor. Tayne and Maryl are captured and are led to be executed. But when Tayne sees the crystals in the idol of Rogor, we realizes they are activated by blood. He breaks free of his captors long enough to activate the crystals and destroy the idol.; Martian scientists send a message to Captain Science asking for help. Slavers on Mars have taken control of the atmosphere plant and the air is running out for those opposed to the slavers. Captain Science tricks the slavers into taking him prisoner where a device is activated, opening a hole in the slaver's dome and releasing a deluge into their sphere. Captain Science makes his way to the atmosphere plant and re-activates the atmosphere for the entire planet.; Captain Science and Rip battle a wizard in the Sahara who plans to bring the world under his control.; Space Ace sets out to collect the reward for finding missing scientist Benton Thorpe, but instead finds a woman drifting in space. He rescues Dalla and hears her tell how her ship was invaded by aliens and Thorpe was captured. He follows her ship to Titan, but Dalla's story was all just part of a trap planned by Flor to capture him. Flor, the leader of the space pirates, intends to get revenge on Space Ace for tricking her in a previous scheme.; Avenger and Teena obtain information that leads them to believe that a Venusian customs official and Venta, star of the Venus stage, are part of a drug smuggling operation. The customs official turns out to be Maag in disguise.; Avenger and Teena investigate a string of bank robberies on Mars, which ultimately leads back to Maag.; Ten thousand years ago, an earthquake forced the people of Atlantis to live inside the Earth. Now usurpers have overthrown Queen Valen and they attack the surface world.; Twenty years earlier, a man and his wife went back in time to the dawn of history and never returned. Professor Blake sends Jack and Tommy back in time to check on the missing couple. When Jack and Tommy arrive, they encounter a tribe led by a mysterious princess who speaks English.; Dr. Belstein has discovered a new planet, Terranova. Rocky X and Simpy are assigned to investigate the new planet.; Dr. Morey has the reputation of a heartless man who cares only for his work and he is nicknamed the "Executioner". When the satellite he sends up explodes along with its pilot, he immediately turns to the causes of the failure. Few people know that the pilot of the satellite was actually his own son.