Rintrah first encountered Doctor Strange when Strange asked Enitharmon to repair his Cloak of Levitation, which had been torn in a battle. After he repaired the Cloak, Enitharmon told Rintrah to return the Cloak to Strange.

Rintrah found Strange just after the sorcerer’s physical body had been badly wounded in a battle with a demon sent by an alien mystic from Strange’s own dimension. Mortally injured, Strange had been forced to release his astral form and take possession of the bodies of two of his friends, Morgana Blessing and Sara Wolfe. While in these two other forms, Strange was just able to beat Urthona’s demon. During the battle, Urthona transported Strange’s house, and everything inside it, to his home planet.

Rintrah found Strange just after intense surgery was performed to save Strange’s physical body. Still inside Sara Wolfe’s body, Strange’s astral spirit asked Rintrah to allow him to project his spirit into Rintrah’s body. Rintrah agreed, allowing both Strange’s and Rintrah’s consciousnesses to inhabit one body at the same time.

Rintrah’s shared body then took Strange’s healing body and borrowed a spaceship from Reed Richards. They traveled to Urthona’s home planet and confronted the alien wizard.

During the battle, it appeared as it Strange had destroyed his magical books and mystical talismans. In actuality, the books and talismans were saved by the magical entity Agamotto, one of the Vishanti. Agamotto later returned the unharmed items to Doctor Strange.

Strange and Rintrah were able to beat Urthona, and free his captives, Wong and Topaz. They then returned to Earth. Rintrah remained with Doctor Strange and accompanied him on several adventures.

Rintrah was a staunch supporter of Strange’s during the troubling times that followed. As Earth was invaded by a number of evil entities from beyond, Doctor Strange was forced to turn to black magic to help defeat them. During this time, Strange allied himself with the black magician Kaluu.

After defeating the dark forces, Strange attained godhood and slowly became detached from humanity. Kaluu, Enitharmon, and Rintrah were able to return Strange to his old self. Rintrah then returned with Enitharmon to his dimension.

Eventually, Rintrah returned to Earth and asked Strange to accept him as an apprentice. Strange agreed and Rintrah is currently living with him in Strange’s home in Greenwich Village.

Recently, Rintrah has been helping Doctor Strange search for a cure for Topaz, one of Doctor Strange’s other allies. Topaz had been possessed by an ancient demon of Sumer. The spell required to banish the demon requires a number of unique ingredients. One such ingredient was the flame from a demon’s head. The search for the demonic fire led Strange and Rintrah to the newest version of the Ghost Rider. They then battled the mysterious villain known as Zodiak, who was apparently backed by mystical masters from another dimension. During the battle, the heroes were able to drive back Zodiak, plus gain a piece of flame from a demon from Zodiak’s home dimension.

During the battle, Rintrah disguised himself to look like Topaz, and he made Topaz look like him. Rintrah chivalrously insisted on doing this, hoping to protect Topaz. Rintrah subsequently took a mortal blow intended for Topaz from the mad Zodiak.

Doctor Strange and Topaz were last seen flying off with the wounded Rintrah, toward the nearest form of medical aid for the dying being.

They arrived back at Strange’s home, where Strange promptly used a spell to remove any taint of black magic from Rintrah’s grievous wound. Strange then used his earthly medical abilities to operate on the wounded Rintrah. Luckily Rintrah recovered, but he is still weak from his recent brush with death.

A day later, Rintrah and Strange’s other friends watched Strange perform the ritual necessary to free Topaz from her possession. To the surprise of everyone but Strange, they discovered that the demon possessing Topaz was not Ullikummis. It was actually Mephisto’s daughter, Mephista. Upon being summoned forth from Topaz’s body, Mephista promised all the heroes that she was going to kill them and take their souls to her father.