and Eric are in Malibu and begins to explain their story to their parents. Cast Fred Savage as Brian Stevenson, an 11-year-old boy Howie Mandel as Maurice, a monster whom Brian befriends Ben Savage as Eric Stevenson, Brian's younger brother Daniel Stern as Glen Stevenson, Brian's hot-tempered father Margaret Whitton as Holly Stevenson, Brian's mother Frank Whaley as Boy, ruler of the monster world Rick Ducommun as Snik, Boy's right-hand man Amber Barretto as Kiersten, a girl Brian likes Devin Ratray as Ronnie Coleman, a bully who bothers Brian William Murray Weiss as Todd, Eric's best friend Brian's father Glen is played by Daniel Stern, who was working on The Wonder Years as the elder, retrospective (voice-over) version of Savage's character, Kevin Arnold. Real-life siblings Fred and Ben Savage play the respective roles of siblings Brian and Eric Stevenson, and their sister Kala played two little monsters. Production Pre-production designs of Maurice and the main little monsters were created by Alan Munro, previously known for his work on Beetlejuice. Principal photography took place from August to October 1988, in Wilmington, North Carolina. Interiors were filmed at DEG Studios (Now EUE Screen Gems). The monster underworld, the toughest portion of photography, was filmed primarily at the abandoned (and some say notorious) Ideal Cement Plant in Castle Hayne, North Carolina. Many of the stairs and bridges were actually built within the plant; some stairs reaching 20 to 30 feet high. A second unit, also working at the cement plant, created and filmed miniatures for forced-perspective shots with the life-sized sets. Production days at the cement plant totaled 1/3 of the film's principal photography - which went 16 days over schedule due to longer than expected filming at the plant. Reminiscing about filming at the cement plant, gaffer Jock Brandis told the Wilmington Star-New’s Cape Fear: Unearthed podcast in 2021: "We used to call it Stage 13. It was bad luck. No one wanted to be out there. The reason we used it was because it was this amazingly flexible place; these huge cavernous spaces made of concrete and steel with walkways and conveyor belts and tunnels and just this fanciful stuff. And you could basically turn it into anything. It was great because the world in Little Monsters was this mythical magical world underground, where it’s eternally night and kids who were smart enough could figure out that there was a portal