"The Sum of His Parts" is the fifth episode of the series and the first season.
On a sunny day, the Teen Titans are having a picnic in the park. As they play a two-on-two round of football, Cyborg suddenly shuts down. After rebooting, he tells the other Titans that his main power cell is dying and that he needs to go back to the Tower to charge it. On his way, he runs into a young boy with a hand prosthesis who declares himself Cyborg's biggest fan because they are so much alike. Before he can properly relate to the subject, an alarm calls Cyborg off, and he races to help his teammates.
Mumbo has just robbed a jewelry store and prepares to evaluate his loot in Tito's Junkyard when the Titans attack him. They are soon joined by Cyborg, who has jury-rigged an emergency battery pack. But during the fight the pack gets shorted from Mumbo's water spray attack, and before he can extricate himself from the hind part of a garbage truck, Cyborg's power cell is completely drained, and along with the refuse he is tipped over into a container with a hole which leads to a system of underground tunnels. Mumbo hijacks the truck for his getaway, and the Titans, thinking that he has taken Cyborg hostage, pursue him. After a long chase through the city, the Titans finally manage to bring down Mumbo, but they realize that they have been going after the wrong target, and so they quickly rush back to the junkyard.
Meanwhile, Cyborg eventually comes to and finds himself in the underground abode of a strange hermit calling himself Fixit, who has recharged his power cell. Though thankful, Cyborg attempts to get back to the surface to rejoin his friends, but Fixit obstructs him, first subtly, then by force. Thinking of Cyborg as a kindred spirit and in urgent need of "repairs", he intends to replace Cyborg's remaining human parts with cybernetic implants to relieve him of his biological imperfections, as he once did with himself. Cyborg was unable to break free or fight back, rendered helpless by Fixit's technopathic powers. But as Fixit prepares to link his mind with Cyborg's in order to download the latter's memories into his new brain, he catches glimpses of the day in the park and of Cyborg's feelings for his friends. The emotions behind them shock and overwhelm Fixit, making him realize that he had lost his own humanity by having made himself a machine. Cyborg offers him to help regain what he has lost, an offer Fixit accepts.
Later on, back in the park, Cyborg re-encounters the kid again, who has brought along a friend. When the boy points out what he has in common with Cyborg, Cyborg good-naturedly points out that the most important thing about them is not their artificial parts, but what they are attached to.
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- The meeting between Cyborg and the boy is a replication of a scene from the comic The New Teen Titans Vol.1 #8 (June 1981). That issue also marks the debut of Sarah Simms, Cyborg's main love interest.
- The villain Psimon was originally going to appear in this episode. However, he was replaced by Fixit. Ironically, the two resemble each other.
- Robin's mask is seen off his face when Cyborg pulls him.
- When Beast Boy is counting, he counts in "Gotham Cities" (1 Gotham City, 2 Gotham City, etc).
- Raven was was never seen without her hood off for the whole episode, but she she was until the end when she sits with the three Titans on a picnic blanket.
- Raven declines a tofu dog from Beast Boy saying she does not eat "fake meat". In reality, Tara Strong (voice of Raven) is a lifetime vegan.
- Refers to Gestalt Psychology belief: The whole is more than the sum of its parts. Meaning Cyborg is capable of more than just his different parts.
- When Cyborg fires at Mumbo in the junkyard, he uses his right arm. But in the next shot, his left arm is raised.
- When Mumbo is stealing the money from the ATMs, the Titans come around the corner; Raven is missing her belt.
- When Mumbo throws the bombs at the Titans, you can see for a split second that one of the bombs has not even exploded.
- After Fixit closed the doors to block Cyborg and before he turned to face Fixit, Cyborg's right ear is metal instead of human.
- When Cyborg gasped about Fixit's mechanical and organic body, his left ear is human instead of metal.
- As Starfire came down along with Raven and Beast Boy and lighten up her starbolt in the dark, Robin and Beast Boy's mouths did not move and their voices echoed lower saying "Cyborg!" and "Cy!".
- After Cyborg got on his knees and looks at the face replacement, the top of his head is gray instead of his skin color.
- It happened again when the screen zooms in on Fixit saying "I had forgotten how beautiful."
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