The most powerful office in the world. The world's most powerful medium. Together, they've changed the course of history.

In the second chapter of our 5-part series "Television and the Presidency," join host Chris Wallace as we sweep from Richard Nixon's campaign for his second term as president through to the election of Ronald Reagan.

The campaign of 1972 saw incumbent President Nixon finally getting comfortable with TV and using it skillfully. But scandal soon would overtake his administration and TV was there every step of the way.

Following the Watergate investigation, the impeachment hearings and Nixon's resignation, Gerald Ford stepped into TV's glare.

Jimmy Carter's presidency was shaken by forces he couldn't control: The Arab oil embargo, the hostage crisis in Iran and the Soviet invasion of Afghanistan.

We end in 1981 with the broadcast of dramatic images of American hostages being released from Iran at the precise moment that Ronald Reagan was sworn into office.

"Television and the Presidency" airs at 9 p.m. ET Saturday and again at 5 a.m. Sunday.