Fermium is a radioactive element, which does not occur naturally on earth. Therefore it needs to be produced artificially. It is named after the physicist Enrico Fermi.

There is no picture of the monster, yet. Urano and Pluto still need to create it in one of their clone-experiments.

Californium is a radioactive element, which does not occur naturally on earth. Therefore it needs to be produced artificially. It is named after the city of Berkeley, California, where it was discovered. It is considered as one of the most expensive materials on earth: One gram of the isotope Californium-252 costs up to 60 million US$!

Curium is a radioactive element, which does not occur naturally on earth. Therefore it needs to be produced artificially.

There is no picture of the corresponding element, yet. Urano and Pluto still need to make the monster in one of their clone-experiments.

Neptunium is a toxic and radioactive heavy metal, which exists on earth only in extremely small traces. It was named after planet Neptune, the neighbour of Uranus, since the element is the neighbour of uranium in the periodic table. It is only used in nuclear technology, specifically for atomic batteries.

Thorium is named after the nordic god Thor. Even though the element is radioactive, it has a half life of 14 billion years (in its most important isotope) – therefore more stable than uranium. It was formerly used for gas mantles in lamps.