 In season seven , Brainiac is revealed to be alive , and is slowly regaining strength by draining people of their natural metal content . Brainiac re @-@ forms into Milton Fine in the season seven episode " Persona " , and learns that his creator , Dax @-@ Ur , is on Earth . Brainiac kills Dax @-@ Ur , downloading the Kryptonian 's knowledge so that he can completely repair himself . In season seven 's " Apocalypse " , Brainiac attempts to go back to Krypton just before it is destroyed and kill the infant Kal @-@ El — he ultimately fails . In the season seven finale , Chloe discovers Brainiac has been impersonating Kara since she and Clark returned from Krypton . Brainiac attacks Chloe and puts her in a coma , but Clark destroys Brainiac before he can locate a device hidden on Earth which would allow him to control Clark . In season eight , Chloe is infected by Brainiac , who attempts to use her as a vessel while trying to take over Earth . In " Legion " , he is subsequently exorcised from Chloe 's body by the Legion of Super @-@ Heroes , and taken back to the 31st Century to be reprogrammed . The reprogrammed Brainiac returns in the season ten episode " Homecoming " to show Clark his past , present , and future and help him find confidence in becoming the hero the world needs . 
