Neo Discovery is the second main expansion of the Neo Series of the Pokémon TCG. In Japan, it was released as Crossing the Ruins..., the second expansion in the Pokémon Card Game Neo Era. It is based on Pokémon Gold and Silver, featuring Generation II Pokémon and themed around the Ruins of Alph and Unown. The English expansion was released on June 1, 2001, while the Japanese expansion was released on July 7, 2000.