• The "151" expansion of the Pokémon Trading Card Game (TCG) was released in 1999 and featured cards depicting all 151 Pokémon from the first generation of the Pokémon video games. This expansion was the first to include cards for the original 151 Pokémon, making it a significant milestone for the TCG and providing collectors with the opportunity to obtain cards for the entire Kanto region Pokédex.

• The "151" expansion introduced several new card types, including Pokémon Egg cards, which depicted the pre-evolved forms of certain Pokémon. Additionally, the expansion included special cards such as the Fossil and Jungle set cards, which were reprinted with updated artwork and text. This expansion was also notable for featuring the first appearance of the Pokémon Mewtwo in the TCG.

• The "151" expansion was well-received by fans and collectors, as it allowed them to complete their Pokémon card collections with the inclusion of all 151 original Pokémon. The expansion's popularity and the nostalgia associated with the first generation of Pokémon have contributed to its enduring legacy and continued demand among Pokémon TCG enthusiasts.