Dexter’s Laboratory: Ego Trip

The robots were built by the future Dexters themselves. After Dee Dee saved the future by pressing the button, the angry Dexters constructed these robots to destroy her, since she stole their moment of glory. However, due to the causal time loop, the robots traveled back to the present and attacked the child Dexter, the same one who would eventually build them. The phrase refers to Dee Dee, the actual saver, though the robots were sent back in time before that was fully resolved.

The robots first appear immediately after the time machine is activated, setting up the time loop that closes at the end.

In the timeline shown, the young adult Dexter left the Neurotomic Protocore sitting on a cubicle floor when traveling further into the future. Mandark found it there, used it to gain power, and built his technological empire. By the time Dexter returns as an adult, Mandark has become his wealthy boss, ruling over a dystopian society where the Protocore's misuse has caused widespread intelligence loss.

The timeline shows Mandark finding the Protocore in the cubicle, which directly enables his rise to power.

Young adult Dexter convinced his younger self to travel further into the future to see how they'd become the great savior. They left the Protocore on the cubicle floor, planning to retrieve it on their return journey. This decision was meant to be temporary but ended up creating the opportunity for Mandark to find and weaponize the device, directly causing the dystopian timeline.

The timeline explicitly shows them deciding to leave the Protocore behind to return later.

During the 4-on-4 battle, child Dexter was weighed down and couldn't reach the switch that would flip the Protocore's output from negative to positive. Dee Dee arrived through the time machine at that critical moment, saw the situation, and pressed the correct button. Her intervention was possible precisely because she wasn't involved in the battle, she arrived as an outsider with a clear view of what needed to be done.

Dee Dee earlier accidentally activated the time machine, showing she knows how to use it.

Mandark discovered the Neurotomic Protocore that Dexter had left in the cubicle. He weaponized it, which triggered a chain of events that devastated humanity. The Protocore's negative output destroyed human intelligence on a massive scale, reducing people to a primitive state while Mandark's robot drones controlled the ruins of society.

The timeline shows Mandark finding the Protocore again in the cubicle, then cuts to the dystopian city.

The multiple Dexters had been fighting specifically to be the ones who would save the timeline and prove their worth. They were determined to be the heroes who fixed everything through their own genius. When Dee Dee arrived and pressed the button first, they felt robbed of their destiny, they had done all the fighting and planning, only for their sister to get the glory. Their anger led them to build the robots to destroy her.

The answer explains their motivation: proving themselves as the saviors throughout the entire journey.

Child Dexter returns to his own time after saying goodbye to his future selves, only to find himself fighting the exact same robots he and his future versions built. This is because the Dexters' plan to destroy Dee Dee created a causal loop: they built robots in the future, those robots traveled back to the present, and child Dexter destroyed them, only to grow up and eventually build those same robots. The loop closes on itself, with Dexter stuck fighting enemies he will eventually create.

The timeline shows robots appearing at the beginning and ending in the same way, completing the loop.

The eldest Dexter they encounter in the utopian future is extremely old, appearing ancient and frail. By the time the Dexters reach him, he has lived for centuries as an omnipotent leader and is now suffering from dementia or extreme age-related cognitive decline. His memory of exactly how he saved the future has faded, which is why he can't explain the specifics to his younger selves.

The timeline describes him as "too old and senile to recall the specifics."

The timeline convergence brought together four versions of Dexter: child Dexter (the original), his slightly older self, the old senile Dexter from the utopia, and a muscular bearded Dexter from the dystopian timeline who had adapted to survive in that harsh world. Each represented a different outcome of the timelines they'd inhabited, and they united to fight Mandark's multiple versions.

The dystopian future shows a fourth Dexter who is muscular and bearded, adapted to that harsh reality.

In the far utopian future, Mandark has been defeated and reduced to a brain preserved in a jar, presumably by Dexter's actions or the natural outcome of their rivalry. This represents total victory for Dexter, who is worshiped as an omnipotent leader in that timeline. However, this utopian version exists separately from the dystopian timeline where Mandark succeeded.

The timeline shows Mandark's brain in a jar as the ultimate symbol of Dexter's victory in that timeline.

The Protocore had two output modes: negative and positive. In negative mode (as Mandark used it), it drained intelligence and caused the dystopian collapse. Flipping it to positive mode reversed the damage, restored human intelligence, and saved the future from Mandark's rule. The switch was the key to stopping the dystopia and restoring order.

Child Dexter is described as trying to reach the switch to flip the output during the battle.

After experiencing the confusion of the time loop, fighting robots he would eventually build, seeing multiple versions of himself, and being unable to understand how his meddling created the paradox, child Dexter is completely overwhelmed and bewildered. He gives up on trying to figure it all out and simply wants to retreat to something normal and comforting: eating a snack. It's a humorously ordinary end to an extraordinary adventure.

The entire movie shows Dexter's frustration with time travel complexities building to this moment.