Speedster (fiction)

A speedster is a character, primarily in superhero comics, whose powers primarily relate to superhuman speed (also known as superspeed). Primary abilities shared by all speedsters include running at speeds far in excess of human capability (to varying degrees) and resistance to the side effects (air resistance, inability to breathe, dynamic shock resulting from contact with objects at high speed, etc.) that result from such velocity. In almost all cases, speedsters can physically attack opponents by striking them at high speed, imparting great kinetic energy without themselves being harmed. A variety of other powers have been attributed to speedsters, depending on the story, their power's origin, and their universe's established continuity and rules. The use of speedsters in fiction requires artistic license due to the laws of physics that would prohibit such abilities. Moving at the speed of sound, for example, would create sonic booms that are usually not heard in such stories, and generate substantial heat. An enormous amount of energy would also be required to achieve such speeds, and Speedsters would need to consume massive amounts of calories to sustain their energy. The Official Handbook of the Marvel Universe states that the character Nova maintains speeds which can be considered "modest", especially when carrying a passenger. It also concedes that a solid object moving in the Earth's atmosphere at several times the speed of sound or faster would wreak havoc on the planet, and that moving at such speeds would prohibit Northstar from breathing, while the generated wind/friction would ravage his body. On the other hand, it states that the character Quicksilver was born with adaptations that make high speeds possible, such as enhanced cardiovascular, respiratory, musculature, and digestive systems, a more efficient metabolism, better lubricated joints, tendons with the tensile strength of spring steel, unidentified bone composition that can withstand the dynamic shock of his touching the ground at speeds over 100 miles an hour, and a brain that can process information fast enough for him to react to his surroundings at high speed.