Overview: Invasion of the Hydronoids Batman, Robin, and Aquaman do battle with underwater aliens who use a device to wipe out human minds. Hitchhike The Wonder Twins help a girl who learns the dangers of hitchhiking the hard way. City in a Bottle Aliens shrink Mid City with the Wonder Twins among the population inside and encase it in a bottle. The SuperFriends pursue them in space to an ice planet and must restore the city before the shrink effect is permanent. Space Emergency When a spacelab and shuttlecraft are placed in danger, Wonder Woman, Hawkman and Hawkgirl fly to the rescue.