Cir-El

Metropolis, a young girl in a costume leaps into battle and throws the villain into a nuclear reactor (in front of a TV news crew and Lois Lane). The girl identifies herself as Supergirl, Superman's daughter. Upset, Lois confronts Superman, accusing him of having an affair, and refusing to believe his claim of innocence, since "Supergirl" looks just like him. However after a cup of the new "Yes" coffee, Lois suddenly calms down and dismisses "Supergirl" as a villain's hoax, until she lands in front of Lois and called her "Mommy".