Iowa State's 2017 team won't be joining Chumbawamba, the Baha Men, Dexys Midnight Runners or A-ha on the storied list of forgettable one-hit wonders.

Three weeks ago, the Cyclones upset one undefeated team in the top five when they beat Oklahoma in Norman. On Saturday, they did it again, this time beating No. 4 TCU 14-7 at home in Ames.

Please excuse the Cyclones if they're feeling high on life these days.

The Horned Frogs' only points of the game came on the opening kickoff of the second half, when KaVontae Turpin scored on a 94-yard return.

The rest of the game was a collection of penalties and turnovers that knocked another team from the ever-thinning ranks of the undefeated. When the day began, eight undefeated teams were still standing. Now, there are just five after South Florida and Penn State joined TCU in the loss column.

When it was over, Iowa State was left celebrating its new life sitting in the driver's seat of the Big 12 race at 6-2 overall and 4-1 in the conference with wins over two top contenders in Oklahoma and TCU.

Because of Iowa State, if the Big 12 is going to put a team into the playoff, it'll have to have a champion run the table over the season's final month. The win also made Iowa State bowl-eligible for the first time since 2012, in the second season under coach Matt Campbell.

TCU's hopes for an undefeated season came unraveled in the red zone. The Horned Frogs entered Saturday fourth nationally in red zone defense, giving up points on just 62 percent of their opponents' trips. But against Iowa State, TCU got a taste of its own medicine. The Horned Frogs got inside the Cyclones 10-yard line after an early third-quarter interception, but Kenny Hill gave it right back with an interception of his own that sailed over the shoulder of his receiver running a slant inside.

The Frogs returned to the red zone midway through the fourth quarter, but Hill fumbled while trying to escape defenders in the backfield, and Iowa State took over. TCU got the ball back with 1:27 and 53 yards left to force overtime, but Hill threw his second interception of the day to Marcel Spears Jr. on the second play of the drive, sending Ames into a frenzy and fans spilling onto the field.

The Cyclones broke into the top 25 last week for the first time since 2005. After Saturday's upset, they're there to stay.

And still climbing.