Download Action Comics #278
- Script: Jerry Siegel (writer id by Bob Hughes)
- Pencils and inks: Jim Mooney
- Synopsis: Superman is ready to announce Supergirl's existence to the world, but she mysteriously loses her powers at the last minute.
- in Action Comics (DC, 1938 series) #360 (March 1968)
- in Supergirl Archives (DC, 2001 series) #2
- in Showcase Presents: Supergirl (DC, 2007 series) #1