DC Database

Quote1 You will travel far, my little Kal-El. But we will never leave you. Even in the face of our deaths, the richness of our lives shall be yours. All that I have, all that I've learned, everything I feel, all this and more, I... I bequeath you, my son. You will carry me inside you all the days of your life. You will make my strength your own. See my life through your eyes... as your life will be seen through mine. The son becomes the father, and the father... the son. This is all I... all I can send you, Kal-El. Quote2
Jor-El src

Jor-El was a member of the Kryptonian Science Council who discovered that the planet and its sun were on the verge of destruction.

His warnings to the Council fell on deaf ears, as they considered this to be inciting sedition.

Earlier in his life, Jor-El was involved in the sentencing of three dangerous criminals, General Zod, Ursa, and Non, for the crime of inciting sedition against the government and banished them to eternal imprisonment in the Phantom Zone. Undaunted by the ignorance of the Science Council, Jor-El built a star ship for his infant son Kal-El to travel to Earth in, providing a green glowing crystal and an energy module containing the last remaining energies of Krypton. Lara viewed the Earth as primitive, fearing that Kal-El would be a stranger among them, but Jor-El assured her that his son would never be alone. As they watched the star ship rise into the sky and depart from Krypton, the ground crumbled underneath their feet, signalling the death of Krypton.

About eighteen years after reaching Earth, Kal-El, who became Clark Kent, was summoned by the green glowing crystal to travel to the Arctic Circle and cast it into the sea, creating a Kryptonian-style structure called the Fortress of Solitude. Inside, Clark activated a holographic representation of his biological father Jor-El, who taught his son the true nature of himself and his ancestry, spending twelve years teaching his son everything the memory crystals had recorded. By the end of the tlessons, Kal-El stood in the uniform of a superhero that the world would call Superman, bearing the family crest of El as a symbol upon his chest, as did his biological father before him.