A speedster is a character, primarily in superhero comics, whose powers primarily relate to superhuman speed. Primary abilities shared by all speedsters include running at speeds far in excess of human capability and resistance to the side effects of such velocities. 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.

Northstar is a fictional superhero appearing in American comic books published by Marvel Comics. Created by Chris Claremont and John Byrne, the character first appeared in The Uncanny X-Men #120 as a member of the Canadian superhero team Alpha Flight.