12 Labours of Hercules VII: Fleecing the Fleece

It's a new bromance from ancient Greece: when cunning Pelias orders the hero Jason to steal the Golden Fleece from the land of Colchis.
Jason turns to another hero for help - Hercules!
Together they build a ship and guide it through the treacherous seas to reach their destination, all the while struggling against the unknown enemy onboard.
To succeed, the heroes will need to chop down the giant Sacred Oak (oops), defeat the guardian dragon, steal the Fleece, and find out who is behind all of this.
Can they do it?