X Factor bosses are to donate profits from the phone vote to replace shamed Frankie Cocozza to charity.
Viewers can throw a lifeline to one of the four acts who were ditched from the show by their own mentors, with 2 Shoes, Amelia Lily, James Michael and Jonjo Kerr in the running.
Now ITV and show producers talkbackThames and Syco have said the profits - amounting to at least 22p per call - will go to Help For Heroes.
None of the four ejected acts has so far faced a public vote, but show bosses decided to bring them back to plug the gap left by Frankie, who was axed from the show on Tuesday after he broke show rules by boasting about drug use.
The winner of the phone vote will return to the X Factor on Saturday night to sing alongside the remaining wannabes to perform either a Queen or Lady Gaga song.
Elaine Bedell, ITV's director of entertainment, said: "In these unprecedented circumstances I'm pleased that we are giving viewers the opportunity to vote for one act to return to Saturday's show and that all profits from this vote will be donated to Help For Heroes."
Phone lines opened at 4pm today and close during the show on Saturday, which begins at 8.15pm, with call terms at www.itv.com/terms.
PA