Brian and Stewie travel back in time to January 31, 1999 to change history, only to alter the past with dire consequences.
Did You Know?
When Stewie and Brian return to the present and it is revealed that Brian stopped 9/11, Peter mentions an AZ football player named Pat Tillman being tackled by his own team. In reality, Pat Tillman was a football player who joined the military after the 9/11 attacks in support of his country. In 2004, Tillman was killed in a friendly fire incident, thus being killed by his own team. See more
One Brian wonders how the 9/11 vote can have an odd number of votes since all of the Brians and Stewies are traveling in pairs. One pair brings Peter along and we see Peter voting, thus the vote tally would normally be an odd number. But Peter actually votes twice, so the total should still be even. It turns out though that one of the Brians is dead and couldn't vote, so an odd tally is correct. See more
What they do turns out to be alright, it's what you're about to do that unleashes utter bedlam!
References Sesame Street