You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: THE "SKY" IS FALLING 
Clue: America's first space station
skylab

Category: THE SPORTS CHANNEL 
Clue: Fly balls & sacrifices are parts of this sport
baseball

Category: TV CAPTAINS 
Clue: Captain Pike was in the pilot, but this captain replaced him in the series

capt. kirk