This is the last scene of the Smallville 8x08 - Bloodline.
Clark and Lois go to the Phantom Zone touching the Crystal that someone send him, and they find Kara: Brainiac put her there.
So, Clark and Kara decides to open the portal just to send Lois back, but a wraith hurt the super cousins and escape.
The wraith was Faora, Zod's wife, she takes Lois's body and she starts looking for her son: Davis/Doomsday
But Davis don't remember anything about her and his past, and she says him something about his fate, then she kills him.
Meanwhile Chloe find out where Clark and Lois are, and she ask Oliver to steal a frequency generator that powers the crystal.
So, with her Brainiac skills she hack in to that and she reverse its effects bringing Clark and Kara back.
Clark and Kara work together to help Lois and put back Faora.
Davis wake up from his death.
Kara is leaving Smallville and she says Clark that she heard rumors that Kandor still exist and that she could save their bloodline.
In the end Davis try to kill himself with a knife, but he break it.
I don't own any of this content.
All rights go on The WarnerBros and The CW