Now that you say it the reference is more than obvious. Haven't watched Captain Planet since I was eight years old.
The best point to suck him out of his 'verse seems the end of Return of the Jedi, right after he died on the Deathstar - his 'return to Light side' as it's often described by fans. Personally, I see nothing of a change in morale in him, he just didn't want his kid being fried by the emperor. Doesn't make him 'good', just a father who's not wanting to see his son die.