Kryptonite is a radioactive Kryptonian mineral / meteor fragment.

It refers to any fragment of the exploded planet Krypton.

The only substance in the universe that can zap (Superman's) strength if he comes within 20 feet of it.

Robin, Professor Goodfellow's G.E.E.C.

There are a wide variety of types of Kryptonite:

Krypton Steel

Krypton Steel is another form of Kryptonite, that is also presumably a very rare form. It's basically Krypton's version of the earth metal known as "steel." It's harmless to Kryptonians, but it's also indestructible to anything except for Superman, or possibly another equally powerful being.[3] Some forms of Krypton steel however, are even indestructible to Superman.[4]

Episode Appearances


The largest known chunk of Kryptonite that ever existed was comparable in size to the entire planet Earth! It even settled into orbit around the sun, becoming a planet itself.

More coming soon!

Super Friends (TV series):


  1. As explained in the episode: The Death of Superman
  2. As seen in the SuperFriends Comic Book, issue #9 (December 1977).
  3. (Although this seems unlikely, since Solomon Grundy and Bizarro are both roughly the same strength as Superman, and yet they didn't even attempt to open a box made of Krypton steel. Instead the Legion tricked Superman into doing it for them)
  4. As seen in The Pied Piper from Space

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.