Doctor Manhattan had no objections to becoming He-El's subordinate.
Ever since an accident in the quantum conversion chamber had transformed him into a quantum being, granting him abilities miraculous beyond measure to biological life and other people alike, he had been called Doctor Manhattan. After his companions had used him to threaten all humanity, forcing humanity to set aside its differences and survive the Cold War, Doctor Manhattan had spent a long time without any particular goal, merely watching humanity and studying the universe.
It was not until he discovered Superman's uniqueness that he began seriously observing Superman.
But after encountering He-El, Doctor Manhattan discovered that He-El possessed a different kind of uniqueness, one that even he could not comprehend.
Especially since He-El possessed a growing Source Universe, which Doctor Manhattan found even more astonishing.
A Source Universe was not something that could be casually controlled by a single living being.
He-El had piqued his curiosity.
He wanted to observe He-El as well, but He-El had remained wary of him.
Now that He-El wanted to take him in as a subordinate, Doctor Manhattan had no objection to it and was willing to serve under him.
"Then gather all your avatars—every part of your consciousness, will, thoughts, and soul—into this physical body before me. Show yourself to me, Doctor Manhattan."
He-El knew that Doctor Manhattan had perhaps agreed to become his subordinate only because he wanted to study him. Once he had studied enough, understood enough, and decided that He-El was no longer mysterious, he might simply leave.
However, He-El was confident that after seeing everything within the He-El Universe, a being like Doctor Manhattan would not be willing to leave.
Anyone who aspired to roam the cosmos, cross universes, transcend space and time, and witness more varied sights would not