Sidewinder is the name of three different fictional characters appearing in American comic books published by Marvel Comics. The original Sidewinder, Seth Voelker, first appeared in Marvel Two-in-One #64, created by writers Mark Gruenwald and Ralph Macchio. A second Sidewinder appeared in 1998 but was killed during his attempt to infiltrate S.H.I.E.L.D. A third Sidewinder, Gregory Bryan, was given powers similar to the original Sidewinder by the Brand Corporation.

The Roxxon Energy Corporation is a fictional massive petroleum industrial conglomerate in the Marvel Universe appearing in American comic books published by Marvel Comics. The company is depicted as having been run by various executives who are typically ready and eager to use any underhanded and illegal option to secure profits, up to and including violent crimes. As such, Roxxon is a consistent opponent of various superheroes.