The cast of characters in Batman expanded over the years as characters evolved and left for their own comic books. The original Robin left to become his own character, Nightwing, in 1984, and new characters took over the secret identity of Robin throughout the years. In 2005, the character of Tim Drake was Robin. In that year, the miniseries "Infinite Crisis" was released. The series was a crossover event of all of the characters of the DC Universe, and had universe-changing consequences. At the end of the series, Batman decides that he needs to focus on keeping his family safe and close, so leaves Gotham City with Nightwing, Robin, and his butler Alfred Pennyworth for a year. After his return, he adopts Tim Drake, formally making him his son in the storyline "Batman: Face the Face".