He-Man and the Masters of the Universe (2002)
The Beginning, Pt. 2
S1 E2:
Prince Adam arrives on the battlefield in the Evergreen Forest to witness the heroes of Eternia facing defeat at the hands of Skeletor's Evil Warriors. Skeletor and Beast Man take to the skies on their Griffins with King Randor as their captive. After witnessing all of this, Adam hurries back to Castle Grayskull where he seeks out the Sorceress and openly accepts his destiny as He-Man...