NiteStar wrote:If Season 4 of G1 TF had carried on I’m sure The Headmasters Theory would have solidified more.
But thats my theory.

No way. We're talking the G1 cartoon here.
I like my way better.
The Headmasters are nothing more than Nebulans (which are a human race and can breed with humans) who have decided to join the battle for various reasons. So they build transector bodies to plug into, and suits that turn them into the heads.
Nevermind that the head transformation would not only leave them exposed, but also bend their bodies in ways that would kill them.

Their personalities are combined. Lord Zarak and Scorponok's personalities are pretty similar. Both Galen and Spike, like Fort Max, are weary and fed up of war. It doesn't hurt anything to take the Nebulan partner and the TF and combine them.
The targetmasters are Nebulans that have decided to help the TF's for various reasons.
The story:
2007 (so it's already happened

)
Galen (from the G1 comics) is the leader of the Nebulans. Lord Zarak seizes power in a coup, and has his minister of defense Arcana create Headmaster technology which Grax builds for him. Then Arcana escapes and gives the technology to Galen.
Then the Autobots and Decepticons crash land on the planet in the middle of all this, and the Autobots decide to help Galen get his throne back. Cyclonus, however, decides he wants to use Lord Zarak for his own ends, but finds himself and the other cons outmatched by Zarak's army of Headmasters. So until Galvatron arrives with reinforcements, the Decepticons are at the Nebulan's mercy.
The fight is on.
Sixshot arrives and is hunting Ultra Magnus. He loses the fight.
Punch/Counterpunch kills TF's on both sides. Nobody knows what side he's on. At the critical moment, he proves himself once and for all to be an Autobot.
Rodimus Prime dies, and Galen as Fortress Maximus becomes temporary leader of the Autobots. Then Galen dies at the hands of Lord Zarak, and Spike Witwicky takes up the mantle.
As Fort Max, Spike defeats Lord Zarak as Scorponok, and Galvatron is so enraged with Zarak that he throws him into a pit to be killed by the Terrorcons, but they are so stupid that they don't even kill him all the way, so Devil Z rescues him, and makes him Black Zarak, but by then Zarak's coup is overthrown and Galen's successor is leader of Nebulan.
Ultra Magnus and Galvatron are both sunk to the bottom of an artic sea with a deep trench and are frozen and lost to everyone.
The battle continues with different characters....
Yeah, it's not canon. Screw canon.