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Starring Pip Donaghy in the title role , the series follows the same plot as the original book , of a deranged scientist who discovers a formula by which to make himself invisible , but is driven to insanity by his inability to reverse the formula and is evoked to use his invisibility to terrorize those around him .
 Pip Donaghy
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Pip Donaghy