Slenky, A.K.A. Experiment 568, is an illegal genetic experiment created by Jumba Jookiba. He was originally designed to have all of the elemental powers, but Jumba accidentally knocked some extra DNA into the mix, and now no one is sure what he does.
Experiment 568 was the 568th genetic experiment created by Jumba with Hämsterviel's funding. He was supposed designed to have all of the elemental powers, but Jumba accidentally knocked some extra DNA into the mix.
568 and the other first 624 experiments were deactivated and smuggled to Earth by Jumba during his mission to capture Experiment 626.
At an unknown point, 568 was activated, captured and named Slenky.
Slenky is a dark yellow Hammerface (033)-like experiment.
His known powers are fire, super-speed, and bullet proof skin. He also has metal bones making him tougher, and also known to smash things with his hammer nose when he's mad.
Water is an obvious weakness, though not only does it stop his fire power, but he's not a very strong swimmer due to his heavy bone structure. Magnets that are powerful enough will also stick to him because of his metal bones.