Joseph teaches that Jesus is the Savior of worlds.
Section 76:22-24, Doctrine and Covenants, The Church of Jesus Christ of Latter-Day Saints, accessed June 7, 2022
22 And now, after the many testimonies which have been given of him, this is the testimony, last of all, which we give of him: That he lives!
23 For we saw him, even on the bright hand of God; and we heard the voice bearing record that he is the Only Begotten of the Father—
24 That by him, and through him, and of him, the worlds are and were created, and the inhabitants thereof are begotten sons and daughters unto God.