Kal Dano

Kal Dano was a scientist from the 27th century who invented the Tox Uthat, a quantum phase inhibitor that could halt all nuclear fusion in a star. Fearing that the device would be stolen by two Vorgon criminals, Dano took the device and hid it on Risa in the 22nd century. The weapon remained hidden there for some two centuries, until it was discovered by Vash in the 24th century. (TNG: "Captain's Holiday")