Photon followed the adventures of a young high school student, Christopher Jarvis with the alias of "Bhodi Li". Chris discovers that the lasertag game Photon is actually a way to detect the strongest warriors in the galaxy, who will then be recruited to fight the forces of darkness. After shooting his laser gun and saying "The light shines!", he would be transported to a space station to join his fellow Photon Warriors. His alien compatriots include an orphan earthling boy genius named Parcival, a shape-changing blob named Pike, a lizardoid named Leon, a cyborg named Lord Baethan, and Tivia, a black ninja princess from Nivia populated by women after the males became extinct. Their mentor is a sentient computer named MOM (Multiple Operation Matrix). The villains' motto is "Let the darkness grow!"
The mission of each faction is to find the Photon crystal on each planet just as it nears the end of its hundred-year charge. If the Photon warriors are the first to shoot the crystal, the planet will be changed into a vital place full of life. If the villains do so, it will become a barren wasteland.