Final boss, stage 1
You must beat this boss without dying. Once you know his moves, you'll know that he'll mainly use a spinning move, and a forward claw strike. The following is a strategy for Captain Planet.
Whenever you know its safe to attack, do Captain's forward-signature attack. Once you get him down to a low enough health, he'll fly away and start to regenerate, and Father will start to fight you as a distraction. Jump in the air, and do his up attack on the boss in the background, and ignore father. Once all his TVs are knocked down, he'll come back to fight. Repeat the cautious forward-signature attack, and keep your eye on Father. Once the boss is down to a certain health, Vilgax will come out while the boss heals. Focus on the boss. When he comes back down, WATCH OUT. THERE WILL BE PITFALLS ON THE MAP. If you fall into them, you die. Captain's Forward-signature move is now pretty much useless, and its not worth the risk of using. Attack with either standard attacks, or with his down-signature move while above the boss. It shouldn't take long for this part, but watch out for those pitfalls.
Monkey's forward attack (where he spins wildly) is GREAT for Professional Hero. It takes off major damage off the final boss. Only issue is that it's hard to redirect him away from the pitfalls. Monkey's spin takes so much damage, you can pretty much ignore whoever the boss summons to fight you while he's flying in the background.
An alternative method is to use Jack. Forward attack will allow you to go back and forth between the boss, taking off health and allowing you to build meter (just don't do it when the boss is doing that spin attack). Whenever he flies into the back, just use the PTE on whoever he summons and it's practically guaranteed to kill them. By using Jack, I didn't even lose my life in that fight even on my Hard runthrough.