Source: Superman's Pal, Jimmy Olsen #105 (1967)
But for now, how about one last hurrah for Jimmy Olsen, with a tribute story that reminds us of his many transformations through the years (at least those prior to 1967). It's called "The World of 1,000 Olsens!", and it goes something like this. Jimmy has been called to an observatory that claims it's discovered a new asteroid. Big deal, thinks Jimmy, until the astronomer who's dubbed it the "Olsen Asteroid" gets disintegrated by a beam from the sky. Jimmy finds close-up pictures of what is more of a planetoid, and the place is populated by his doubles!
Human Octopus (weird, because it was just a dream), the Human Porcupine, and the Wolf-Man. While he's there, the prison is inspected by Senator Olsen, who has a luscious beard.
Which is what exactly? Here's the hint I promised: