 In the episode " Fracture " , Kara is discovered and brought home by Lex , who wants to exploit her amnesia to his benefit , with the intent of discovering the truth about Clark . In season seven 's " Traveler " , Chloe convinces Jor @-@ El to return Kara 's memory and powers before Lex can learn her and Clark 's secret . When Lana is placed in a catatonic state by Brainiac in the episode " Veritas " , Kara agrees to cooperate with him in the hope that he will not kill Lana . In " Apocalypse " , Kara is taken through time to Krypton , just before it explodes , so that Brainiac can kill the infant Clark . With Jor @-@ El 's help , Clark manages to arrive on Krypton and stop Brainiac . Unknown to Clark , Brainiac is not killed in their fight on Krypton , and he manages to place Kara in the Phantom Zone , while he assumes her identity back on Earth . In the season eight episode " Bloodline " , Clark is transported to the Phantom Zone , where he finds Kara . Working together they escape , and Kara leaves Earth to search for Kandor , a city rumored to hold surviving citizens of Krypton . 
