Lanthanoid Clan

The Lanthanoid Clan are a group of 15 master criminals, of which their home base is unknown (as are any of their current whereabouts). Their names, or more likely codenames, are:
 * Lanthanus
 * Cerius
 * Praseodymius
 * Neodymius
 * Promethius
 * Samarius
 * Europius
 * Gadolinius
 * Terbius
 * Dysprosius
 * Holmius
 * Erbius
 * Thulius
 * Ytterbius
 * Lutetius