I think it was a cartoon series because I remember multiple episodes. In one episode there is a villain woman named Morgana and she was an ex girlfriend of the guy who rides pegasus.. In one episode a guy tries to be like the guy who can transform into a samurai warrior and gets the same powers and they battle as giant warriors. Anybody remember the name of this cartoon series?

Morgana enemy of Merlin the Magician
Hercules rode a flying horse

Maybe,.

Freedom Force (http://www.internationalhero.co.uk/f/freeforc.htm)

View Intro (http://www.youtube.com/watch?v=3U8UWKCGX44)


Episode:
The Scarlet Samurai
In one episode Toshi's friend envies his power.
An evil wizard grants the boy Toshi's power to
Transform into a giant samurai warrior. The
Young boy challenges his former friend to a
Fight to find which of them is the mightiest warrior.

Definitely Freedom Force.

Samuri jack?