Elastic Lad
From superman.nu: Supermanica
One of Jimmy Olsen's rather unique transformations and personas.
After swilling a bottle of an alien liquid, natch, Jimmy finds he can stretch like Plastic Man. After the effects of the extraterrestrial elixir wear off, leave it to zany scientist, Professor Potter, to whip up a fresh batch for Jimmy to imbibe every now and then.
As "Elastic Lad", Jimmy adventures with the Legion of Super-Heroes in the 30th Century.