Clark's biological mother Lara is played by Helen Slater, who portrayed Supergirl in the 1984 movie. See more...
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Continuity: In the Season 7 episode "Cure", In the scene where Clark and Knox fight, Knox smashes his blue container with his weapon. Shortly after this, there is a shot where he is looking in horror at what he'd done and behind him, Chloe is struggling with her ankle cuffs. She appears to be wearing shoes in this frame, where-as before and after, she is barefoot.