Gohan and Videl kissed in the episode called "Gohan no Hachamecha Hatsu Deto!?" or "Gohan's First Date." This episode was the eighth episode in the Great Saiyaman Saga, and it was episode number 202 of Dragonball Z.
The episode aired in Japan on Sept. 29, 1993, and it aired for the first time in the United States on Nov. 27, 2001. The episode was scheduled to air in the USA on Sept. 19, 2001, but it was pushed back in the schedule because of the terrorist attack that occurred on September 11th. The episode features a tall building which catches fire, and this scene was deemed too sensitive to show so soon after the attacks.