Ion was an angel under Naomi's command. He was one of the angels who worked with the intelligence department of Heaven, and thus, was held privy to most of Heaven's operations that were kept secret from lower angels. He and Esper were tasked with finding Castiel and recovering the Angel Tablet. But they were repeatedly thwarted by Castiel's cunning. He finally managed to capture Castiel by massacring the people inside a Biggerson's location, which lured Castiel to the place and kept him from teleporting to another location. He tortured Castiel for the tablet's location.
Later he was shown to be a double agent, under Crowley's employ. Crowley told him to keep an eye on Castiel as he had to attend to Kevin. There he lamented the mindless slaughter and no questions asked policy of the angels. He was killed when Castiel dug the Angel Blade bullet out of his abdomen and thrust it into Ion's eye, killing him.
- Angel Blade - An angel blade could kill Ion.
- Angel-killing bullets - Melted angel blades forged into bullets could also kill Ion.