 The metallic disc is returned to Clark following the death of Virgil Swann. Placing the disc in the cave reveals a message from Jor-El instructing Clark to find the Kryptonian knowledge crystals. The message goes on to tell Clark that allowing a human to assemble the crystals could lead to the destruction of Earth and so Clark joins Lana, Lex and Jason on a hunt for one of the crystals in China.