Such metals include lithium, niobium-tantalum, bismuth, antimony and rare earths. This period contains the lanthanides, also known as the "rare earths". The rare earths again precipitate out at higher pH. The world fades to white as the two Earths collide. They are later summoned to fight alongside the Titans of Infinite Earths against Hexagon. He died during Crisis on Infinite Earths. She took up residence during the Crisis on Infinite Earths. These powers received changes after the events of "Crisis on Infinite Earths". "Crisis on Infinite Earths" in January 2020. Wolfman conceived the concept of the character long before plans for "Crisis on Infinite Earths". These quotas have been interpreted as an attempt to control the supply of rare earths. The largest known is estimated to consume matter equivalent to 10 Earths per second. Brainiac retained this appearance until after the "Crisis on Infinite Earths" miniseries. Hoechlin will return to the Arrowverse for the "Crisis on Infinite Earths" episodes. He revisited the role in "Crisis on Infinite Earths".