The famous American author, better known as Mark Twain, who became entangled in the Enterprise crew's adventure in 1893 San Francisco.
Samuel Clemens is the American writer known as Mark Twain. In 1893 San Francisco he overhears Data and Guinan discussing time travel and becomes suspicious that aliens are meddling with Earth's history.
In Time's Arrow and Time's Arrow Part II, Clemens follows the Enterprise crew and eventually travels to the 24th century aboard the Enterprise. Seeing a future without poverty and prejudice changes his outlook, and he returns to his own time so that Picard can come home, taking charge of the injured Guinan and the away team's debts. He was played by Jerry Hardin.