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Invictus is the main antagonist of the animated science fiction television series Final Space as well as the Lord Commanders' master.
Invictus was first mentioned in the season premiere for season 2 wherein Nightfall kills The Lord Commander but additionally tells him that when his master inevitably revived him, she was coming for him next. Sure enough, shortly after the Lord Commander's death, his body dissolves into energy as a demonic voice is heard implying that Invictus wasn't through with him yet.
The episode "Arachnitects" provides further information about the enigmatic Invictus. According to the Arachnitects, they were created by a higher race of beings beyond comprehension and they in turn formed Final Space, bringing the Titans into existence to assist them. Invictus stood as the truly malevolent of the Titans and poisoned them, corrupting the Titans against their creators. The only Titan that didn't fall under Invictus' influence was Bolo who managed to seal the Titans and Invictus into Final Space. Invictus attempted to escape Final Space throughout the millennia, until one instance resulted in Gary Goodspeed's father John sacrificing himself to close a rift to Final Space, the resulting explosion culminating in Mooncake's birth. Because of Mooncake's presence, the Arachnitects vote to abduct Mooncake and send him into Final Space as a way of fixing the cosmological imbalance.
Gary tries to stop Mooncake's fate which also consequently grants Mooncake his powers. Seeing this, the Arachitects allow Mooncake to return to Gary's care but they insist that he must not use his powers in a way that risk Final Space being opened lest they take him back. On the Crimson Light, Mooncake hears Invictus, taunting that while he and the others were safe now, he would still find a way to escape.