Foundation Season 1 showed Hari Seldon's dream, the Foundation, surviving the First Crisis. Yet, the Foundation had people like Salvor Hardin to guide them and help them succeed. They also did not have the eye of the Empire on them. Now as Brother Day has realized that the threat of Hari Seldon still exists, the Empire has set their armies on the Foundation. The settlers of Terminus have no Salvor and almost no guidance from Seldon. Yet, the new Imperial threat may quickly become a useful ally.
Source：https://www.cbr.com/foundation-bel-riose-threat-ally/
