Justice League (2011-2016) #51

A TITANS: REBIRTH #1 prelude! Set shortly after the formation of the Justice League, Batman introduces his new partner Robin (Dick Grayson) to the team just as it's pulled into a deadly assault on Metropolis by mysterious creatures. Outclassed and terrified, the Boy Wonder must use his wits and guile to survive. And in doing so, he catches the attention of a foe that will alter the course of his life forever. This story ties directly into TITANS: REBIRTH #1!