In a planet colonized by humans in the far future, after the death of the earth, the legend of Superman has survived. In his memeory, a group of people was genetically modified to have partial powers of Superman. However these powers came with secondary effects.
Fontaine, the leader of the League of Supermen, have Superman’s heat vision. However he must release the acumulated energy every fifteen minutes in powerfull discharges or he will die.