It is currently believed that only 1.5% of the human genome serve any purpose. The rest is known as "junk." Its function is unknown.

Free Agent Junk is the sole survivor of a nuclear attack, and it's a closely-guarded secret how he managed to escape alive. Junk's current mission is to rendezvous with the mysterious criminal "X" who has been sending Junk messages lately. X wants Junk's help to meet the Reverend Nagil, founder of a heretical religious sect. X has secrets of his own and Junk is the key to uncovering the truth behind X's own identity.