This article discusses striking pleadings based on non-disclosure, focusing on the 2018 case Mullin v. Sherlock. This decision, at the time of writing, was infrequently cited on CanLii and Westlaw, which surprised the author, who found that the case provided a general framework for this type of motion, including the court’s direction that a motions judge should be specific on what is being struck, and it provides useful precedents.