During the Leviathan War, Sam and Dean Winchester are able to steal the Leviathan Tablet from Dick Roman and the Leviathans with the help of Charlie Bradbury. When the two free the tablet from its clay housing, teenager Kevin Tran is made into a Prophet capable of reading the tablet. Kevin later translates the tablet, identifying a weapon capable of killing Dick Roman and defeating the Leviathans. The King of Hell Crowley learns of these developments when the Winchesters turn to him for his blood for the weapon and is intrigued.
During the Battle of SucroCorp, Kevin is freed from his imprisonment by the Leviathans by Sam Winchester. The two witness Dean kill Dick Roman with the help of Castiel before both Dean and Castiel disappear mysteriously. As Sam tries to figure out what happened to Dean and Castiel and Kevin fears the arrival of more Leviathans, Crowley appears and tells them that he has "a small army" of demons outside to deal with the remaining Leviathans in the building now that Dick is dead and they are left disorganized. Crowley then summons two demons who grab Kevin and he tells Sam that Kevin is now his. With a snap of Crowley's fingers, Kevin and the demons disappear as does Crowley moments later, leaving Sam alone.
After capturing Kevin, Crowley has him given a haircut and a manicure and pedicure in order to try to gain his cooperation. Crowley then has Kevin taken to a warehouse where he reveals the Demon Tablet and asks Kevin to translate it for him. Kevin reads the tablet and after some trouble, tells Crowley that there's a section on how to open a Hell Gate, one of which is in Wisconsin. Crowley has his demons gather the ingredients for the spell from all over the world and then goes to Wisconsin, leaving two demons to guard over Kevin. After being ordered to proceed, Kevin casts the spell, but its really a demon bomb. Instead of opening the Hell Gate, Kevin's spell kills the two demons guarding him. Taking his chance, Kevin steals the Demon Tablet and escapes before Crowley can return.
Following his escape, Kevin goes on the run with the demon tablet and tries to reach out to Sam Winchester for help to no avail as Sam has quit the hunting life. Kevin spends a year on the run during which time he learns that the tablet contains a method to close the Gates of Hell forever. Kevin is also able to learn defenses against demons such as holy water and devil's traps from the demon tablet which he eventually hides in a bus station locker. A year after his escape, Kevin is found by the Winchesters following Dean's return from Purgatory and relates the story of his capture and escape to them.
- In Torn and Frayed, Kevin tells Castiel and Dean that Crowley's demons had to collect the spell ingredients he used in his escape from all over the world.
- When Kevin escapes, it is the first of three times the demon bomb is used in battle on the show. It is also the only time it is used in the form of a spell rather than a bomb.
- Kevin is later captured by Crowley for a second time.