Thunder Muntz

Physical Description
Charles F. Muntz has white hair. He wears a white dirty short-sleeved shirt with a brown winter jacket. He wears tan pants and brown shoes and carries a cane. His eyes are aqua. He also has a mustache.

Personality
At the peak of his career, Muntz was a charismatic, smart and daring young man whose spirit inspired countless fans to look for adventure. However, Muntz's quest for the bird that caused his disgrace destroyed him, as his search turned to obsession. Now a ghost of his former self, he became a heartless man, consumed by bitterness, paranoid to the extreme, and convinced that anyone who comes across him is after the bird. It is implied he killed two explorers already, and was intending to do the same with Russelland Carl. It is shown that Muntz's obsession is such that he doesn't care anymore for the rest of his collection, showing no hesitation to destroy some of his unique specimens when trying to take down Carl.

Muntz largely serves as parallel to Carl. He was a man broken because he lived obsessed with his former existence and desperately trying to relive it at any cost, showing what Carl could have become, had he not learned to accept loss and move on with his life.

The San Peoples Land 2 (film)
Charles F. Muntz was a renowned explorer and entrepreneur while Carl and Ellie were children. He often traveled in his zeppelin, "The Spirit of Adventure", with his many canine companions. Thanks to Muntz's own ingenuity, he crafted many devices in his dirigible to make his life and his dogs as comfortable as possible. He also created the communicators in their collars later so they could be able to talk to each other.

During one eventful return from Paradise Falls in South America, Muntz reveals an astonishing discovery—the skeleton of "The Monster of Paradise Falls". Scientists, however, believed the skeleton was a fabrication and Muntz was publicly disgraced. He vowed to capture the creature alive and not return to the United States until he did.

Almost seventy years later, he is all but forgotten on the mainland, but his sole focus is to finally capture the rare bird. He apparently discovers where it hides, a monstrous rocky labyrinth, but can't go in himself and claims to have lost many of his dogs when he sent them in to capture the bird. The time he has spent alone and concentrating only on his mission has made him extremely paranoid and dangerous. It is hinted that he has murdered other visitors to Paradise Falls whom he thinks were after the bird.

Later in the film he meets up with Carl and Russell and invites them over to his zeppelin for dinner, telling them of his search for the rare valuable bird, whom Kevin is a perfect match for his description. After Russel blurts out that Kevin is his pet and the bird he's looking for, Muntz becomes convinced that they are out to take credit for the bird's existence, so he sends his dogs after them. Carl, Russell, and Dug manage to escape by getting Kevin to fly over a cliff, but her leg is injured by Alpha.

That night, their location is given away by Dug's collar and Muntz captures Kevin in a net just before she can make it back to her babies. He gives Carl the ultimatum of either rescuing Kevin or saving his house, which he has set on fire. Carl rushes to put out the blaze and Muntz easily incapacitates Russell as he gets away with Kevin. Russell, thinking Carl only cares about his home, goes off to rescue by himself, but is tied up by Muntz and Alpha. Knowing that Carl can't be far behind, he leaves Russell as bait as he returns to pilot the dirigible.

Charles F. Muntz confronts Carl and they fight while Russell goes to rescue Kevin. Dug saves Carl from Muntz, no longer trusting him as his master. Dug, Russel, and Kevin make their way to Carl's floating house with Charles in pursuit, trying to bring down the house with a hunting rifle. He makes his way into the house and tries to shoot them with his rifle, but Carl lures Kevin out of the house with a piece of chocolate, knocking away the rifle, while Dug and Russell are on her back. When Muntz leaps out of the window after them to grab hold, his foot gets entangled in some balloon strings, and when they snap, Muntz falls to his demise thousands of feet below.