Munro made his film debut playing a college fraternity brother in the action thriller "Run" (1991) and went on to make appearances in Clint Eastwood's acclaimed Western "Unforgiven" (1992) and the following year's big screen adaptation of Stephen King's "Needful Things". 1994 saw the actor in the comedy "Wagons East!" and the horror sequels "Trancers 4: Jack of Swords" and "Trancers 5: Sudden Deth". A featured role in the little seen comedy "Downhill Willie" followed in 1996, before the greater visibility of the MTV produced and promoted "Dead Man on Campus" made him a more familiar film presence. In 2000, Munro racked up a host of big screen appearances, with supporting turns in the Norm Macdonald starrer "Fool Proof" as well as the karaoke themed Bruce Paltrow film "Duets" (starring Gwyneth Paltrow). Higher profile roles came that year with Keenen Ivory Wayans' teen horror send-up "Scary Movie", and Munro made his starring debut that year in "Camouflage", playing a failed actor who pursues a career as a private investigator under the tutelage of Leslie Nielsen's veteran detective.

While films brought Munro his greatest exposure, television was the actor's springboard, offering him numerous roles and valuable experience. He was particularly prolific in the genre of movies made for television, frequently playing a loutish jock type in dramas with teen protagonists (e.g., 1994's "Moment of Truth: Broken Pledges" and 1996's "Stand Against Fear: A Moment of Truth Movie") or, in later years, a young police officer in telepics like "Our Guys: Outrage in Glen Ridge". In the mid-90s, Munro was a seemingly ubiquitous in NBC's intense "Moment of Truth" dramas of which he acted in no fewer than six. Besides the exposure afforded by his dozens of television movie appearances, and recurring roles on "Wiseguy" (CBS, 1990) "JAG" (CBS, 1999) and "Charmed" (The WB, 1999), Munro was often recognized in North America for his 1991-1993 regular stint on the teen drama "Northwood", aired in his native Canada.