Boundaries Crossed was released in November 2012 and featured 149 cards and 4 secret cards. Boundaries Crossed was the set to introduce ACE SPEC Cards, a classification of item cards. Along with this, Black 2 and White 2 introduced several new formes of Pokemon, including Black Kyurem & White Kyurem. The set introduced Secret cards with golden Holofoil card borders and special etching on Full Art Cards.
The secret card Altaria #152 is sought after in this set along with Bianca #147 & Skyla #149.