Bertram Momberquette, Jr.

Bertram Momberquette, Jr. is a fictional character played by Donnie Antle in the 2018 film, Grim.

Bertram is the audio technician of the documentary crew, as well as the owner of Prestige Audio Rentals through which he was contracted by Alastor Gwen and subsequently employed Ashley Cormier to serve as his boom mic operator.

Development and Casting
The character of Bertram was created by Fritz Bishop in his initial draft of a script for Grim, originally referred to as "Sound Guy 1" and initially conceived as a silent, passive observer. Throughout the course of revisions and casting changes, the character became assertive and outspoken, being re-written as an independent business owner and employer of Ashley (then "Sound Guy 2").

Casting underwent many changes throughout production, Martin Robinson and John Bury, who co-wrote and co-directed Bigsby, were originally considered for the roles in the "silent duo" incarnation of the characters.

Donnie Antle was immediately cast by Fritz and Kenzie after a brief reading at the Tarbox, he later chose the name of the character and developed his backstory as the owner of Prestige Audio Rentals.

Appearances
Grim (2018)