I'm late to the show as usual. These cubes were available as a doorbuster for Black Friday at Target. They retailed for $9.99 or were free with a qualified $50 purchase of Legos, which wouldn't be hard to hit at Target. There were two cubes available each with 4 minifigures each. Each cube had a Ninjago, Legends of Chima, DC Superheroes and a City themed Minifigures with gray stands.
DC Comics Superboy
In the other box you got: