*Mephiles the Dark is one of the primary antagonists in Sonic the Hedgehog (2006). He is the malevolent conscience, mind and will of the sun god Solaris. Mephiles was born during the Solaris Project when the experiments on Solaris split him into Mephiles and Iblis. After his birth, Mephiles was sealed inside the Scepter of Darkness by Shadow the Hedgehog, but was freed ten years later during a skirmish between Shadow, Rouge and Dr. Eggman.

After his release, Mephiles orchestrated a centuries-long plan to release Iblis from Princess Elise and rejoin with it, which succeeded when he killed Sonic the Hedgehog. He then re-merged with Iblis, remaking Solaris, but was defeated by Sonic, Shadow and Silver, and subsequently erased from existence. In the intervening years, Dr. Eggman somehow acquired the Scepter of Darkness.

In the present day, the Scepter was shattered during a struggle between Eggman, Shadow, and Rouge the Bat, and Mephiles was released. Mephiles absorbed Shadow's shadow, and transformed into a copy of Shadow; in doing so, he absorbed Shadow's powers as well. Upon gaining his new form, he then laughed in amusement at the irony about how he was resurrected by the shadow of the person who sealed him away before sarcastically thanking Shadow for releasing him. Realizing that Shadow did not know who Mephiles was (as Shadow had not yet traveled back in time to face Mephiles in the past), Mephiles transported Shadow and Rouge into the future.

Mephiles then sought to find the Chaos Emeralds in order to bring pain and despair to Princess Elise and release the "Flames of Disaster" (a.k.a. Iblis), who had been sealed inside Elise's soul until she cried. Mephiles intended to fuse with Iblis, reuniting them into a single entity, Solaris, their original persona. To accomplish this, he traveled to the future and implied to Silver the Hedgehog and Blaze the Cat that Sonic the Hedgehog was the cause of Iblis being released, which led to the destruction of their world.*