Warning: This story contains spoilers.

Stephen Colbert is lending his voice to the resistance in Hulu’s “The Testaments” before he bids farewell to “The Late Show.”

Colbert made a surprise voice cameo in the new series, a sequel to “The Handmaid’s Tale” based on the follow-up novel by Margaret Atwood that follows a new generation of women in the totalitarian society of Gilead.

In the show’s first episode, which premiered Wednesday, Colbert serves as a broadcaster for the resistance network Radio Free Boston, where he reminds listeners, “Don’t let the bastards grind you down,” a rallying cry ripped from the series’ predecessor in a show that premiered during Donald Trump’s first administration.

Bruce Miller — creator and showrunner of the new Hulu series and its predecessor — told TV Insider that Colbert, whose late night TV staple was canceled by CBS in a move that many critics have perceived as political in nature, was “a good person to be the voice of free speech in America.”