On stardate 83189.1, the USS Kirk and a Federation convoy arrived in the P'Jem system just in time to prevent the USS Leviathan from being destroyed by the Plok'tau, an Undine dreadnought. Thelin contacted the Leviathan, offering assistance, which was gladly accepted.
Later, on stardate 83738.2, the Kirk was besieged by the IKS Baj and was boarded by Captain Targan and his men. The Klingons were looking for Miral Paris, who they believed to be the Kuvah'magh. She revealed herself, likely to protect her captain, despite his protests. Though they succeeded in capturing her, the Klingons were driven off the Kirk by Dylyp Azeli and an away team from the Leviathan. Thelin explained why the Klingons were after her – how she was seen as a savior for her people by some – and that B'vat was the likely mastermind of her capture, having much influence in the Klingon Empire.
Kardok then emerged from the shadows, stating that B'vat had as many enemies as allies in the Empire. Thelin was initially skeptical of Kardok's sincerity in offering help, but he changed his mind when Kardok revealed that he had brought a support vessel to help the Kirk perform repairs.
- Star Trek: Federation Legacy – "Diplomatic Orders" (First appearance)
- Star Trek: Federation Legacy – "Past Imperfect"