DRAX the Destroyer

The cosmic powerhouse known as Drax the Destroyer actually began life on Earth as a simple man named Arthur Douglas. Upon returning from seeing Elvis live in 1953, he, his wife Yvette, and their daughter Heather happened to be in the wrong place at the wrong time. While flying over on his first Earthbound scouting mission, Thanos became worried that the people inside a car saw him and destroyed the vehicle with Arthur's family inside.
Meanwhile, Arthur's soul floated out into space where Kronos captured it and infused it with the body he created to stop Thanos. Since then, Drax has gone through a variety of changes, but always focuses his intense powers on one thing: killing Thanos.