Yeah, Nightwing is Robin. 你 see, in the comics, Dick Grayson, the first Robin, after joining the Teen Titans and facing The Judas Contract, in an attempt to distance himself from Batman, dawned his own new identity; Nightwing. Since the series jumped ahead 5 years, similar to when the comics skipped one 年 after Infinite Crisis, a grown-up Robin emerges as Nightwing (following the flow of the comics). Hope that helps
Dick Grayson is Robin in YJ:I. There is this whole complicated thing about how Dick becomes Nightwing and is replaced 由 Jason Todd, who dies (in the sacred hall of dead 超能英雄 thing in episode 9) and is then replaced again 由 Tim Drake, the Robin in the new show. There are actually 5-6 Robins in total (not sure). I don't know if they will have all of them though... that's all I know. :)
