10897
These briefings were read by voice actor Bob Johnson in the original series and the 1988 revival but the identity of the character was never revealed , nor was his face ever shown .
 Bob Johnson
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:
 Bob Johnson