Pixar has announced the voice casts for two of its upcoming films during the D23 convention today.  Director Bob Peterson’s The Good Dinosaur, which opens next summer, takes place on an Earth where the asteroid never killed the dinosaurs and the creatures now live happily alongside humans.  The lead character, a dinosaur named Arlo, will be voiced by Lucas Neff (Raising Hope), while Bill Hader, Neil Patrick Harris, and Judy Greer voice his siblings.  The dinosaur mother and father will be voiced by John Lithgow and Frances McDormandThe Good Dinosaur opens in theaters on May 30, 2014.

Pixar’s next film, Up director Peter Docter’s Inside Out, takes place within an 11-year-old girl’s mind as she is forced to move to San Francisco.  The fantastic voice cast—playing the girl’s emotions—includes Amy Poehler as the lead character, Joy, Bill Hader (there's no such thing as too much Bill Hader) as Fear, Lewis Black as Anger, Mindy Kaling as Disgust, and The Office’s Phyllis Smith as Sadness.  Inside Out opens in theaters on June 19, 2015.  Look for Dave’s full recaps of the D23 Pixar panels later today. [Update: We've added new concept art images and the official synopsis for both films after the jump.]

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Here's the official synopsis for The Good Dinosaur:

“The Good Dinosaur” asks the generations-old question: What if the cataclysmic asteroid that forever changed life on Earth actually missed the planet completely and giant dinosaurs never became extinct? In theaters May 30, 2014, the film is a humorous and exciting original story about Arlo, a lively 70-foot-tall teenage Apatosaurus with a big heart. After a traumatic event rattles Arlo’s tranquil community, he sets out on a quest to restore peace, gaining an unlikely companion along the way—a young human boy named Spot.

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Here's the official synopsis for Inside Out:

From director Pete Docter (“Up,” “Monsters, Inc.”) and producer Jonas Rivera (“Up”), Disney•Pixar’s “Inside Out” takes you to a place that everyone knows, but no one has ever seen: the world inside the human mind. Riley, an 11-year-old girl who recently moved with her family to San Francisco, is not the main character but the setting for the film. Moviegoers will go inside her mind to explore how memories are formed and how a mixture of five emotions—Joy, Disgust, Anger, Fear and Sadness—defines life experiences. In theaters June 19, 2015.