David William Thomas is a Canadian actor, comedian and television writer, known for being one half of the duo Bob and Doug McKenzie with Rick Moranis. He appeared as Doug McKenzie on SCTV, for which he won a Primetime Emmy Award out of two nominations, and in the film Strange Brew (1983), which he also co-directed. As a duo, they made two albums, The Great White North and Strange Brew, the former gaining them a Grammy Award nomination and a Juno Award.

Bob and Doug McKenzie are a pair of fictional Canadian brothers who hosted "Great White North", a sketch which was introduced on SCTV for the show's third season when it moved to CBC Television in 1980. Bob is played by Rick Moranis and Doug is played by Dave Thomas. Although created originally as filler to both satisfy and mock network Canadian content demands, the duo became a pop culture phenomenon in both Canada and the United States. The characters became the focus of a bestselling comedy album, The Great White North, in 1981 and starred in a feature film, Strange Brew, in 1983. They were later revived for an animated series, Bob & Doug, which premiered on Global in 2009.