Here's my list:
Give and Let Give - Plot was good. Moral was good. The sequence where Jason, Michelle, and Midgel have to save Fidgel and Planet Sharealike was really good. This is the episode where I can take Cavitus seriously as a villain.
Git Along, Little Doggies - I love that this is a western episode. Too bad there was no Christmas episode or superhero episode or they would've made it on this list.
Wise Guys - A 3-2-1 Penguins! time traveling episode?! This. is. so. awesome!!!
Hogs and Kisses - Plot was good, reminded me of "The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe," or at least, part of it. Moral best appeals to teenagers.
Oh, Mercy - I love the allusion to one of Jesus' parables.
In the Big House - What a great way to end the series!
This may change over time.