Just before their wedding, Lois and Clark probe the theft of exotic amphibians, which leads them to a freakish biologist and a plot to assassinate the President.

Tempus, the time traveler, returns to Metropolis as a Presidential candidate bent on controlling the minds of the masses.

With Superman lost in a time warp, an alternate Superman from another dimension helps Lois combat the diabolical Tempus, the new President-elect.