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Kretz was a geneticist at the Hilltowne University's Department of Genetics and a friend of Galvin Burdette. He would later be fired by Macy Vaughn at the order of department head, Dr. Julia Wagner.
History
In "Sweet Tooth", TBA
In "Other Women", TBA
In "Out of Scythe", TBA
Appearances
| Season One Appearances (3/22) | |
| 1. "Pilot" | 2. "Let This Mother Out " |
| Absent | Absent |
| 3. "Sweet Tooth" | 4. "Exorcise Your Demons" |
| Appears | Absent |
| 5. "Other Women" | 6. "Kappa Spirit" |
| Appears | Absent |
| 7. "Out of Scythe" | 8. "Bug a Boo" |
| Appears | Absent |
| 9. "Jingle Hell" | 10. "Keep Calm and Harry On" |
| Absent | Absent |
| 11. "Witch Perfect" | 12. "You're Dead to Me" |
| Absent | Absent |
| 13. "Manic Pixie Nightmare" | 14. "Touched by a Demon" |
| Absent | Absent |
| 15. "Switches & Stones" | 16. "Memento Mori" |
| Absent | Absent |
| 17. "Surrender" | 18. "The Replacement" |
| Absent | Absent |
| 19. "Source Material" | 20. "Ambush" |
| Absent | Absent |
| 21. "Red Rain" | 22. "The Source Awakens" |
| Absent | Absent |