In this final volume of Astro's atomic-powered adventures, Astro must save a human time machine, commands a mission to Mars, and battles a rampaging robot Frankenstein!

"This volume collects stories previously published in Astro Boy volumes 20, 21, 22, and 23, published by Dark Horse Comics"--Title page verso. "Originally published in Japan in 1952"--Title page verso.

Meeva -- Robot bombs -- Mission to Mars -- Sea Serpent Island -- Frankenstein -- The coral reef adventure -- The test pilot -- Super cyclone -- A little background information -- Astro returns -- The bomb train -- Showdown in the Standard Deviation Kingdom -- Astro's first love -- Slippery catfish in imminent danger -- Astro II -- I am Knowall -- You're guilty! -- Bad-guy robots -- The time machine -- The brain swap -- The end of Astro Boy -- The robot disposer -- Franken -- Astro vs. Atlas -- Pula, the baby elephant -- Guinness book robots -- The berserk robot -- The magnet robot -- Giant Uran -- Space doll -- Ghosts in the desert -- The space bug -- Crazy duck -- A feline guardian deity -- The space shuttle -- Showdown on Mt. Fuji -- The silver tower.