Ironvine is a substance used in the 1983 animated series He-Man and the Masters of the Universe
Ironvine was an almost unbreakable substance on Eternia. It was strong enouth go withstand repeated blows from the Power Sword without showing any signs of wear. Prince Adam once found a bunch of it in a jungle clearing while in a picnic. He and his companions mentioned that it could be as a fishing rope to catch a Dragonwhale.
He-Man once successfully used this vine-like substance to close a growing fissure in the ground. Later he also used it as a swing rope in an underground cavern, with less successful results.