Isis and Ivar were a pair of twins with outrageous behavior and were known as troublemakers. They were in league with Frederick when he was an acting-out teen. They had an incestuous affair which lead to their banishment from Asgard.
They then spent the past centuries around the Earth trying to find the portal back to their own realm.
Ivar and Isis discovered the portal in East End and wanted to use it to go back home. They kidnapped Victor Beauchamp and tormented him to extract the truth, though his lips remained sealed. Isis located Wendy Beauchamp at her date. When they learned that Frederick was in town, they plotted to kidnap his twin, Freya, to get the Serpens Clavem - the portal key, but their plan was foiled when Frederick killed Ivar by snapping his neck and Joanna saved Freya.