Atomic Fire is a Master Weapon usable exclusively to Heat Man that appears in the Mega Man comic series published by Archie Comics. Atomic Fire allows the user to shoot giant fireballs at the opponent(s), hence its name. Although it is Heat Man's exclusive Master Weapon, Mega Man can also use the Atomic Fire Master Weapon for his own usage if Mega Man copies the Master Weapon with his Copy Chip from the Robot Master.
When Mega Man uses this move, his regular blue color scheme is switch to an orange and red color scheme attire, which is the primary color of fire. It should be noted that this Master Weapon changes Mega Man into the same color attire as Fire Man's Master Weapon, the Fire Storm.