Let's see, so many to choose from so I'll cheat a bit and break it down into favorite episode per season.
Season 1: Lucy Does A TV Commercial
Season 2: Job Switching
Season 3: Home Movies
Season 4: Ethel's Home Town
Season 5: Lucy and John Wayne
Season 6: Deep-Sea Fishing
Comedy Hour Episodes
Season 7: Lucy Hunts Uranium
Season 8: Lucy Goes To Alaska
Season 9: Milton Berle Hides Out At The Ricardos
My favorite episode would have to be the one where Lucy and Ethel was in the candy factory stuffing their faces and hates etc trying to get a job!! These women are by-far my Idols Love you Lucy
Oh goodness... so many great episodes. One that I really liked was "Ricky Needs an Agent." I cracked up at the part where Ricky was really mad and he was breaking all that stuff... he was just so hilarious! XD
They're all good, but my favorite one is the one where they go with the Mertzes to the cabin in ohio, where the bed moves every time the train passes. It's one of my parent's favorites too.