A Klingon festival at which performers re-enact in song and mock combat the defeat of the tyrant Molor by Kahless, attended by Worf and Alexander on Maranga IV.
The Kot'baval Festival commemorates the victory of Kahless the Unforgettable over the tyrant Molor. Street performers play the two figures, sing the story in Klingon and fight a staged bat'leth duel, drawing onlookers in to take up Kahless's cause.
It appears in Firstborn in 2370. Worried that Alexander shows no interest in becoming a warrior, Worf takes him to the festival at the Klingon outpost on Maranga IV in the hope of kindling some enthusiasm. The boy enjoys it and joins the mock fight.
That night the two are ambushed by assassins and saved by K'mtar, who presents himself as an adviser to the House of Mogh. He is eventually revealed as Alexander himself, come back from the future to push his younger self towards the warrior's path.