Tess Mercer, the new and more deceptive CEO of Luthorcorp, picked by Lex to run the company should something ever happen to him.Tess’ primary goal was finding Lex, which drew her inquisitively to Clark, whom she believes will be able to help her find Lex. Tess learns about Krypton and the name “Kal-El”, though she does not attribute any of the information directly to Clark.
Lana later informs Tess that Lex surgically implanted a nano-transmitter into Tess’s optic nerve so that he could keep an eye on everything she is doing. Visibly upset by this, Tess places a jamming device into her necklace to disrupt the signal, but not before telling Lex that she will cut him off from the outside world and sell off everything that he owns.
Tess admits to having a brief relationship with Oliver Queen after she saves his life. He constantly calls her “Mercy”. Tess later sells controlling interest in LuthorCorp to Queen Industries.