In the film, Martin Brundle due to his inherited mutant genes ages a lot faster, which in appearance he is 20 years old, underneath he is a 5 year old boy. In real life, there is a rare genetic disorder called Werner Syndrome, which is unusual accelerated aging (progeria).
The Fly II
Martin Brundle, born of the human/fly, is adopted by his father's place of employment (Bartok Inc.) while the employees simply wait for his mutant chromosomes to come out of their dormant state.
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