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Doctor Farrell is a scientist who apparently works with Don Vizioso in dissecting and experimenting on mutants. Vizioso mentions Farrell twice in Mutant Gangland, but Farrell is not seen. In the first mention he uses the full title "Doctor" and in the second mention he abbreviates this to "Doc".
Previously on the 2012 TV series, Dr. Victor Falco also bore many strong similarities to the original Feral, including an unethical experimentation on mutants, experimentation with telepathy, and recruiting giant mutant rats as servants.