Sentinels of the 9th the second expansion for Bottom of the 9th introduces 12 superheroes from the beloved world of Sentinels of the Multiverse to the game in an expansion pack outside the box. There are new pitchers batters and suppoer personal- all with a superhero touch The Sentinels of the 9th pack is foil-wrapped like baseball cards. Features . Release Date - 11 13 2015.