OK. Here is the list of my top 5 episodes: 1- The Oracle, 2- The Doppelganger, 3- Orpheus, 4- Sir Caradoc at the Round Table & finally, my number 5- Isis and Osiris. I like both parts 1 & 2 tbh. Cannot decide which part I like better tbh. Sorry for replying so late on my own forum post. I really thought somebody would beat me to it. Guess I was wrong. Being the first is not always that great. There's not much MythQuest pictures available online, but here are some of them that I was able to find so far. Hope you like all of them.

Here's Alex as Orpheus, visiting Hades, a Greek Underworld, or a Greek Hell if you like, even though it's just a part of Greek mythology for it was long before the Christianity.

Here's a picture of Cleo.

Here's Alex as Osiris.

And here's another picture of his sister, Cleo, just for you.

Alex as Osiris, one more time.

Here's Cleo once again. Or should I say here's Meredith Henderson instead? This is a screenshot taken from a MythQuest opening credits, but that's also how Cleo used to look like in episode Red Wolf's Daughter.

This is Alex in Doppelganger.

And this is Alex one more time. This time it's a poster for an episode The Hammer of the Gods.

And finally, both Bellows siblings, together at last.

#1 - "Red Wolf's Daughter", #2 - "The Oracle", #3 - "Minokichi", #4 - "Orpheus", and #5 - "Quetzalcoatl". I also like "The Blessing" and some other episodes, but you said top 5, not top 10, so here's my top 5

Here's Alex as Minokichi. Watch it! She's Yuki-onna, a Japanese snow demon, you know.