In this episode, Lieutenant Worf suffers a crisis of faith which leads him to an encounter with the seemingly resurrected messiah of ancient Klingon religious and historical beliefs, Kahless.
He soon finds himself caught between supporting the religious figure and the more secular leader of the conventional Klingon political power structure.
Riker finds Worf's quarters filled with incense and burning candles while his chief of security sits before a small fire in a trance-like state.
Gowron provokes a D'k tahg duel with Kahless and wins, leaving Worf to ponder how the "greatest warrior of all" could be beaten.
[2] The episode was released as part of the Star Trek: The Next Generation season six DVD box set in the United States on December 3, 2002.
[1] In the book Star Trek FAQ 2.0 (Unofficial and Unauthorized): Everything Left to Know About the Next Generation, the Movies and Beyond (2013) they said that Conway delivered a "righteous and inspiring" Kahless and it was one of Dorn's best performances as Worf.
[7] In 2017, Io9 noted "Rightful Heir" for being one of the "weirdest" TNG adventures, with Worf helping to install a Kahless clone as Emperor of the Klingons.