With the series tied at two, Houston jumped out to a 5-2 lead over Philadelphia heading into the eighth inning and, with Nolan Ryan on the mound, it looked as if the Astros were destined to go to the World Series for the first time in franchise history.
Ryan had been on his game for most of the night, scattering five hits and walking only one batter while striking out eight. What happened next surprised everyone in attendance.
Philadelphia led the inning off with three consecutive singles, the last of which was a sacrifice bunt by Gabe Gross up the third base line, loading the bases for Pete Rose. Charlie Hustle dug in and worked a seven-pitch walk off of the Ryan Express, cutting Houston's lead to 5-3 and forcing Ryan from the game.
Left-handed reliever Joe Sambito, who would finish fifth in the NL Cy Young Award voting in 1980, got pinch-hitter Keith Moreland to hit a grounder to shortstop, but the Astros weren't able to turn two, only getting Rose on the force out at second base.
Ken Forsch relieved Sambito, striking out Mike Schmidt for the second out of the inning and, in theory, taking Philadelphia's most dangerous bat out of the equation.
Del Unser, pinch-hitting for pitcher Ron Reed, smacked a single to right field, scoring Gross and tying the game at five. The next batter, Manny Trillo, proceeded to crush a game-tying, two-run, two-out triple to left field, giving Philadelphia a 7-5 lead.
Those heroics were needed, as the Astros would tie things up in the bottom of the inning, scoring two runs on four singles off of Tug McGraw, and, after a scoreless ninth inning, the game headed into extra frames.
With Unser on second base and one out, Gary Maddox laced a shot to center field that Terry Puhl misplayed, allowing Unser to score and giving Maddox a go-ahead, RBI double.
Philadelphia reliever Dick Ruthven would work his second consecutive 1-2-3 inning to wrap things up for the Phillies, who would go on to defeat the Kansas City Royals in six games for the team's first World Series championship.