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Bart, who guest starred on ABC's Revenge as author Mason Treadwell, will play a Wildermann, "a bearded, 'Grizzly Adams-type' character," on Grimm, reports Entertainment Weekly.
The episode will have Bart taking on the legend of Big Foot, played by Kenneth Mitchell.
Grimm is a fantasy-crime series inspired by the fairy tales of the Brothers Grimm that focuses on detective Nick Burkhardt (David Giuntoli), who is a descendant of supernatural fighters.
The series also features Russell Hornsby as Burkhardt's homicide partner, Bitsie Tulloch, Silas Weir Mitchell, Sasha Roiz and Reggie Lee.
Grimm was recently picked up for a second season by the network.
Watch a preview clip of Grimm below:
