Dino Charge Dark Ranger (Power Rangers : Dino Charge)

Millions of years ago, when Lord Arcanon assaulted a kind-hearted Heckyl's homeworld, Sentai 6, to gain the Dark Energem, Heckyl tried to protect it from getting into the hands of evil. While he was on the run from Arcanon, he fell and the Dark Energem came out of its containment box. An injured Heckyl tried to get a hold of it, but when he touched it, he started getting surrounded by dark energy and ended up bonding with it, the evil Energem corrupting him and creating a monstrous alter-ego known as Snide. Arcanon arrived and retrieved the Energem and said that he won't remember any of this incident or his past