Superman, Batman and Robin move into action when an inventor's valuable plans are put in peril by the terrorizing tactics of a mysterious Marsh Monster. Those far from home Wonder Twins and Gleek try to rescue some misguided teenagers who face trouble when they decide to become runaways. The SuperFriends exhibit all their bravery against the super sinister scheme of Professor Fearo and the threat of a world collision. A scientist finds trouble when a time machine puts him 2000 years into the future. Superman, Hawkman and Hawkgirl come to the rescue.