However, there's no official episode called "My Little Pony Friendship Is Magic - 2010 Princess Twilight Sparkle Part 1 4-1".
It's possible you're referring to:
* "Friendship is Magic" (Season 1, Episode 1): This is the very first episode of the series and aired on October 10, 2010. It features Twilight Sparkle learning about the importance of friendship.
* "A Canterlot Wedding" (Season 2, Episode 26): This is the two-part finale of Season 2 where Twilight Sparkle helps with Princess Celestia's wedding. It aired on May 19, 2012.
If you're looking for information on a different episode, please provide more details about the episode title or the plot.