Jim Rook was the lead singer of The Electrics, a rock band, who entered a run-down shop named Oblivion Inc. Inside, he was somehow transported to the strange dimension Myrra, where he was the descendant of the mighty Myrra warrior Nacht.

He took his ancestor's Sword of Night, a sword with the ability to warn of danger and force a person to speak the truth, and became involved in the conflict between Myrra and the evil warlocks.

After his adventures in Myrra, he opened a bookstore in the Oblivion Inc. and became active with other superheroes Primal Force and Swamp Thing.

He later became active again as the leader of the Shadowpact.

Jim was the proprietor of a mystical pub called the 'Oblivion Bar'. It existed inside its own dimension, with its own rules and methods. For example, the bars phone does not work unless the dimension's area code is known.

When the Shadowpact team entered the mystical shield around Riverrock and defeated the murderous Pentacle, they lost a full year of their lives, though they only perceived about a day passing. Back 'home', Jim discovered his bar had been taken over by a man, who possessed powerful telekinetic abilities. Many other people could have easily been tossed out the door but the new 'owner' could squeeze shut a trachea. Jim handled this situation mainly by ignoring him and failing to convey needed information. Jim became swept up in other events, mainly organizing his team into a more effective fighting force.

Recently, it was revealed that the longer he's in possession of the sword, the less he ages. Rook learned that his sword is inhabited by it's last wielder, his own father.