Thor: Tales of Asgard

Thor: Tales of Asgard is a story set before Marvel's God of Thunder was banished to Midgard (Earth), as it depicts him as a teenager training to be a warrior, only to have his opponents let him win out of pity. After finding out about it from Odin, who saw Thor turned his training into public entertainment, Thor decides to defy his father's orders and leaves Asgard for Jotunheim, home of the frost giants, along with Loki on a secret quest that is a passage of manhood.

For something that could be set before Thor came to Earth, it is okay, but it's flawed. After major scenes, the movie cuts to somewhere else, showing other characters, which can be painful to some. Also, the story is kind of iffy, and the voice cast is a hit-or-miss. Best to watch to see if it clicks.