S10, E18: Vala's father, Jacek, contacts Stargate Command to trade information about a series of planned attacks on Earth in exchange for sanctuary on the planet. Once safe, Jacek reverts to his scheming ways, and he is later found to be associating with one of Arkad's Jaffa splinter cells. When challenged on his motives, Jacek once again manages to persuade the Stargate team.