Mikołajczak's animation dub credits include Huckleberry Hound in various Hanna-Barbera productions, Wildcat on TaleSpin, Hamton J. Pig on Tiny Toon Adventures, and John Jameson on Spider-Man. Live action dubbing credits include Ron Cook in Thunderbirds and additional voices in The Stepford Wives. His on-camera roles include a guest spot on the Polish TV remake of The Nanny.