It's a normal day in Titan's Tower. Beastboy and Cyborg are arguing over who's the best in videogames, with Starfire standing over them trying to decide which of her friends to cheer for. Robin is in the gym training on his martial arts moves for the next battle against evil. Raven is in her room meditating to keep her powers in check.

All in all it's a normal day. Normal except for a strange unmarked package which has just been dropped outside of the door to Titan's Tower, along with a ringing of the doorbell.

Who answers the door and discovers the package?