The episode is, without a doubt, the best the series has to offer. From the dialogue to the fight scenes, everything seems perfect.
Thor is challenged to a fight by Hercules, who came down on Earth just for fun. The battle is very intense, and even though there is a limited amount of animation, the drawings shown are incredible. After all, they are original designs from the famous Marvel comics. Watching this episode (and the rest, for that matter) could actually be considered as reading a comic book.
The ending of the episode is great. Thor loses the fight, because his father, Odin, has taken away half of his powers as punishment for falling in love with a mortal. After that dramatic ending, Thor walks away in shame, while Hercules gloats over his victory. Great ending for a great episode, not the usual "happy ending". Marvel has proved once more its greatness.