Re: Favorite JL/JLU episodes
The time traveling episode is Once and Future Thing, great episode.
Some of my favorites are(no particular order):
Secret Origins - How could anyone not love the debut of the JL lol
Kids Stuff - Brooding 8y.o. batman.. comedic gold
A Knight of Shadows - I love any episode with Etrigan
The final two episodes of JLU with Darkseid and then the Brainiac fusion is one of my favorites as well.
"Well, I guess the laws of physics cease to exist on top of your stove!"