Give a stream of consciousness and then the final answer. Batman: Under the Red Hood is a 2010 American animated superhero direct-to-video film produced by Warner Bros. Animation and released by Warner Home Video. It is the eighth feature in the DC Universe Animated Original Movies series. It was released on July 27, 2010. The film stars Bruce Greenwood as Bruce Wayne / Batman, Jensen Ackles as the Red Hood / Jason Todd, John DiMaggio as the Joker, Neil Patrick Harris as Nightwing / Dick Grayson, Jason Isaacs as Ra's al Ghul, and Wade Williams as Black Mask. The screenplay was written by Judd Winick, who also wrote the "Under the Hood" run in the monthly Batman comic.

Answer this question: who does neil patrick harris play in batman under the red hood?

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
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The important part for answering this question is: The film stars Bruce Greenwood as Bruce Wayne / Batman, Jensen Ackles as the Red Hood / Jason Todd, John DiMaggio as the Joker, Neil Patrick Harris as Nightwing / Dick Grayson, Jason Isaacs as Ra's al Ghul, and Wade Williams as Black Mask.
So, the final answer is Nightwing / Dick Grayson.