Beta and Gamma

Beta and Gamma are two dogs led by Alpha and are minor antagonists in Disney/Pixar's 2009 film Up. Beta is voiced by Delroy Lindo and Gamma is voiced by Jerome Ranft.

Up
Beta and Gamma are Alpha's second and third in command, and they both wear a translation collar that enables them to talk. They were sent on a mission to find a rare bird and bring it to their master. They later encounter Carl Fredricksen, Russell, Dug, and Kevin and take them to their master, who turns out to be an elderly Charles Muntz, Carl's idol. After learning about Russell's friendship with Kevin (the bird), Muntz furiously sends Beta and Gamma, as well as the rest of the pack, after Carl, Russell, Kevin, and Dug.

Beta and Gamma are seen later driving biplanes. Outside, Russell sees Carl and Kevin in trouble. Encouraged, he manages to climb to the porch of the house. Planes continue to attack, but he manages to stop the planes by calling out that he sees a squirrel; this distracts Beta and Gamma, as well as the other dogs, and makes them collide all of their planes.

Beta and Gamma are seen again at the cockpit. As Alpha sticks his head through the steering wheel to reach Dug (who had lost the bird earlier), Dug sticks a lampshade over Alpha's head, breaking his collar, returning his high-pitched voice, and trapping his head in the steering wheel. Believing Alpha is now wearing the "Cone of Shame," Beta and Gamma, as well as the rest of the the pack, take Dug as their leader and listen to his every command.

Beta and Gamma are last seen among the other dogs at Russell's ceremony. They howl with approval after Russell is awarded the grape soda badge by Carl in the film's closing scenes.

Dug's Special Mission
Beta, Gamma and Alpha are tripped by Dug, causing them to lose Kevin. When Alpha gives Dug "special missions," Beta and Gamma show support, but they get hurt along the way and almost killed. They eventually leave Dug while Alpha calls "master" to tell him that Dug caused them to lose the bird, and that he is a bad dog.

Trivia

 * Beta and Gamma are two of the three types of radiation in real life, along with Alpha.