S10, E5: Lois decides to tell Clark she knows he's The Blur, but she accidentally activates an ancient artifact that transforms her into the Goddess Isis, complete with superpowers of her own. Oliver and Clark reluctantly decide to ask Tess for help with Lois. Meanwhile, after Cat Grant (guest star Keri Lynn Pratt) witnesses Lois as Isis using her superpowers, she decides Lois is the Blur and sets out to prove it.