He was portrayed by Rob Archer.
Knox first appeared when Hope van Dyne paid a visit to Burch in order to pay for a part that her father Hank Pym needed to create a portal to save his wife Janet. However, upon learning about Pym's technology, Burch decided to double-cross Hope by having Knox and several of his men to fight back against Hope. Using her Wasp suit, Hope was able to fend off the thugs before going off with the part after paying off Burch, who angrily vows to get the technology by all means.
To that end, Knox followed upon Burch's plot to track down Hope, Hank, and Scott Lang to get the technology, clashing themselves against Ghost, who too intends to steal the technology, but only to cure herself from a dying disease she suffered. Eventually, they caught wind of the trio's current location at the house of Bill Foster after Uzman drugs Lang's friend Luis with truth serum, despite an annoyed Uzman and Anitolov claiming that it's not truth serum. Burch then contacts the FBI (thanks to their inside man Stoltz), who then arrest Hope and Hank while Lang is forced to escape. However, this allowed Ghost to finally get her hands on Pym's lab.
Eventually, Lang managed to break Hope and Hank free from custody before initiating their plan to save Janet from the quantum realm. As such, Knox tries to follow Hope and Luis in his own car, but Hope shrinks her car to escape, causing Knox to crash his car in Lombardo Street.
It is unknown what happened to Knox afterwards, either he died in the crash or was arrested alongside Burch and their men for their crimes.