- "It's already mutated into human form! Shoot it!!!"
- —Sherman Peabody
- " "Careful, Pa," Sherman warned. "Don't get too close or he'll take over your brain." / "What the hell are you talking about, boy?" / Sherman still had the comic book in his hand, opened to the story about space zombies from Pluto. "It's all in here, Pa," he said. "Read it." / "Who's got time for reading now?" his father asked, not without logic. "
- —From Back to the Future by George Gipe (quote, page 74)
Sherman investigated the barn with his father when the DeLorean time machine crashed into it in 1955. He believed the vehicle to be an alien spaceship after reading a science-fiction comic book called Tales from Space — as well as recalling a movie he had seen, H.G. Wells' The War of the Worlds. When Marty McFly exited the DeLorean in the radiation suit, the family ran in fear.
Behind the scenes
- Sherman's name was not mentioned in the film, but in the credits.
- He is the only Peabody whose first name is revealed in the film credits; his parents and sister, whose first names are also not mentioned in the film, are listed in the credits as "Pa Peabody", "Ma Peabody" and "Peabody Daughter".
- The name was a reference to "Peabody's Improbable History", a feature on the cartoon The Rocky and Bullwinkle Show. In a reverse of the "boy and his dog" story, Mr. Peabody was a dog who had invented the "WABAC", a time machine, and Sherman was his boy, a young man who accompanied him on his travels through history. The show, which made its debut in 1959, was a favorite of both Bob Gale and Robert Zemeckis.