Carrie Underwood gave fans a blast from the past by performing "Alone" on "American Idol," two decades after doing so on the show in 2005.

Carrie Underwood opened the latest episode of American Idol on Sunday, April 27, with a cover of Heart's "Alone," and fans say she "took the season by storm" with the nostalgic performance.

“American Idol” judge Carrie Underwood has surprised viewers with a callback to her time on the show in 2005. At the beginning of Sunday’s episode, Underwood sang “Alone” (covered by ...

Underwood, 42, has been slipping in and out of character since May 2005, when 30 million viewers watched her crowning as the fourth-season victor of “American Idol.” ...