Task: Explanation
Input (English): James Tiberius "Jim" Kirk is a fictional character in the "Star Trek" franchise. Kirk first appears in "" and has been portrayed in numerous films, books, comics, webisodes, and video games. As the captain of the starship USS "Enterprise", Kirk leads his crew as they explore "new worlds, where no man has gone before". Often, the characters of Spock and Leonard McCoy act as his logical and emotional sounding boards, respectively. Question: What is the middle name of the fictional character, who used characters called spock and McCoy as his logical and emotional springboard, and who was captain of the starship USS Enterprise in an American Science fiction franchise which included an episode called Space Seed where the crew discover a sleeper ship holding superpeople from Earth's past?  Answer: Tiberius
Output (English):  Often, the characters of Spock and Leonard McCoy act as his logical and emotional sounding boards, respectively.