It is in Episode 461, 'The Beginning of the Battle! Ace and Whitebeard's Past". Ace meets Shanks in a cave, thanking him for saving his brother Luffy.
Before episode 1. Luffy was with Shanks as he grew up.
Luffy never fought Ace except when they were kids, just for practice.
The episode Ace was Season 11, episode 22; original air date May 12, 2010.
episode 94 and 95
In the story so far (manga and anime) he has not had a reunion yet. Oda would probably make it happen sometime in the new world ( the second half of Grand line). Shanks had a chance to meet up with him at the end of the war at Marineford. However he chose not to, preferring Luffy keep the promise he made on his own.
After ace dies, it starts at episode 393
Daniel Jackson was explained as being away with SG-11 on another mission. I don't know when the episode was filmed, but it is possible Michael Shanks was working on another project and wasn't available.
Episode 316.
Episode 4
ace first appears in chapter 154. episode 91.
episode 316
episode 37
The episode Ace was Season 11, episode 22; original air date May 12, 2010.
In the story so far (manga and anime) he has not had a reunion yet. Oda would probably make it happen sometime in the new world ( the second half of Grand line). Shanks had a chance to meet up with him at the end of the war at Marineford. However he chose not to, preferring Luffy keep the promise he made on his own.
episode 94 and 95
They meet in episode 163. The episode is released now.
After ace dies, it starts at episode 393
they meet songo in episode 24
They meet in episode 1