The Doom Patrol, Beast Boy's former teammates, have been captured and Beast Boy and the Titans have to find them. Later, they discover that the Doom Patrol have been taken captive by their worst enemies, the Brotherhood of Evil.
Villain(s): Brotherhood of Evil (The Brain and Monsieur Mallah)

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The Doom Patrol, now free, get Beast Boy to rejoin the team on their hunt for the Brotherhood of Evil while refusing the Titans' help. While on their mission, each of the Doom Patrol are worn out by the villains of Brotherhood of Evil. Beast Boy and Mento, the last remaining members, infiltrate the Brotherhood's fortress. The Titans and the rest of Doom Patrol join the two.
Villain(s): Brotherhood of Evil (The Brain, Monsieur Mallah, Madame Rouge, and General Immortus), Adonis, André LeBlanc, Angel, Atlas, Billy Numerous, Cheshire, Cinderblock, Control Freak, Ding Dong Daddy, Doctor Light, Fang, Gizmo, H.I.V.E. Headmistress, I.N.S.T.I.G.A.T.O.R., Jinx, Johnny Rancid, Kardiak, Katarou, Killer Moth, Kitten, Kyd Wykkyd, Mad Mod, Malchior, Mammoth, Master of Games, Mother Mae-Eye, Mumbo, Overload, Plasmus, Phobia, Private H.I.V.E., Psimon, Professor Chang, Punk Rocket, Puppet King, Red X, See-More, Source, Steamroller, Trident, Warp, Wintergreen, Witch, Wrestling Star, and XL Terrestrial

The Brotherhood of Evil has begun its plan to eliminate young superheroes across the globe. With honorary Titan Wildebeest captured, Madame Rouge is after the Brotherhood's second target, another honorary Titan known as Hot Spot. Detecting the threat, Teen Titan Robin immediately heads for Morocco.

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Villain(s): Madame Rouge, The Brain, and Monsieur Mallah

As the Teen Titans are away dealing with the Brotherhood of Evil, the Titans East come to Jump City to watch over, but they have some trouble gaining acceptance among the public. Meanwhile, Control Freak escapes from prison, ready to face off against the Teen Titans with a series of challenges designed specifically for them, sure to succeed.

Note: Only Cyborg appears via communication. Beast Boy, Raven, Robin and Starfire are absent in this episode.

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Villain(s): Control Freak, André LeBlanc, and Punk Rocket (cameo)

While the Teen Titans are fighting a mysterious creature in Russia, Starfire searches for the monster everywhere by herself and gets lost in a blinding snowstorm. Starfire is rescued by a young radioactive soldier named Red Star, who hides away in a battle shelter to prevent his power from harming others. When the rest of the Titans arrive, however, they find out the creature is derived from his power. Red Star joins the Titans in defeating the radioactive creature, but the battle causes a change in him. Red Star asks Starfire to send him into space, where he releases his power. Red Star is now a Titan.

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Villain(s): Radiation Monster

During a fight against a new and improved Dr. Light in the Arctic Circle, the Teen Titans fall through a layer of ice. They find themselves in a jungle where they discover two new superheroes — Kole, and her caveman sidekick, Gnarrk, who invite to their place for nourishment. However, Doctor Light discovers them too and captures Kole, using her crystal-generating abilities to amplify the effects of his machine. The Titans and Gnarrk find Kole and Dr. Light, and a battle ensues. Gnarrk overcomes his technophobia and destroys Dr. Light's machine while saving Kole. The Titans give Kole and Gnarrk a Titans locator, which the Brotherhood of Evil tracks down from their headquarters.

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Villain(s): Dr. Light

Raven is tasked with bringing three young superheroes – Melvin, Timmy Tantrum, and Teether – to a monastery while avoiding interference from Monsieur Mallah. The task proves difficult as Raven's patience with the kids' tantrums is tested.

Absent: Cyborg and Starfire

Villain(s): Monsieur Mallah

While the Titans are away, the H.I.V.E. Five cause panic in the city, committing various crimes. However, Kid Flash interrupts their crime spree before being captured.

Absent: Robin, Starfire, Cyborg, Raven and Beast Boy

Villain(s): H.I.V.E. Five (Jinx, Gizmo, Mammoth, See-More, Kyd Wykkyd, Billy Numerous) and Madame Rouge

When Ding Dong Daddy steals a briefcase containing Robin's most prized possession, Robin races him to get it back, with the rest of the Titans and a host of villains joining in.

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Villain(s): Ding Dong Daddy, Red X

The episode tells the origins of the Teen Titans. Starfire escapes capture from the Gordanians and lands on Earth, causing mayhem for the town. Robin, Beast Boy, Raven, and Cyborg arrive to stop her. When they calm her down, the Gordanians call for Starfire to return or Jump City will be destroyed, and they work together for the first time to help her stop them.

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Villain(s): Starfire (initially), Trogaar and the Robber

As the Teen Titans return to Jump City, the Brotherhood of Evil get ready for their final attack. When the Brotherhood of Evil make their move, the Teen Titans have begun recruiting young superheroes. As the ultimate battle between the Titans and the Brotherhood of Evil begins, Robin has a strategy of his own.

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Villain(s): Brotherhood of Evil (Adonis, Angel, Atlas, Billy Numerous, The Brain, Cheshire, Cinderblock, Control Freak, Creature from Jones Lake, Fang, General Immortus, Gizmo, I.N.S.T.I.G.A.T.O.R., Johnny Rancid, Kardiak, Katarou, Killer Moth, Kitten, Kyd Wykkyd, Madame Rouge, Mammoth, Monsieur Mallah, Off-World Outlaw, Overload, Plasmus, Private H.I.V.E., Psimon, Punk Rocket, Puppet King, See-More, Steamroller, Trident, Warp, XL Terrestrial, and 7-Gorn-7)

With all the Titans scattered across the globe and the Brotherhood of Evil taking down young superheroes one by one, Beast Boy leads Pantha, Mas, Herald, and Jericho – the only ones left – to take on the Brotherhood and rescue the Titans. Ultimately Beast Boy frees all the Titans from being frozen by the Brain, who all fight the Titans' rogues gallery. Kid Flash and Jinx show up as a couple and help the Titans in the fight. Robin captures the Brain and then offers all of the heroes a communicator and thanks them for their help. The episode ends with the Titans and the fifty new extended members ready for all their future fights, together.

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Villain(s): Brotherhood of Evil (Adonis, Amazing Mumbo, André LeBlanc, Angel, Billy Numerous, The Brain, Cheshire, Cinderblock, Control Freak, Ding Dong Daddy, Fang, General Immortus, Gizmo, H.I.V.E. Headmistress, I.N.S.T.I.G.A.T.O.R., Johnny Rancid, Kardiak, Katarou, Killer Moth, Kitten, Kyd Wykkyd, Madame Rouge, Mad Mod, Malchior, Mammoth, Master of Games, Monsieur Mallah, Mother Mae-Eye, Overload, Phobia, Plasmus, Private H.I.V.E., Professor Chang, Psimon, Punk Rocket, Puppet King, See-More, Steamroller, Trident, Warp, Wintergreen, Wrestling Star, and XL Terrestrial) and Dr. Light

The Titans return from their adventures to find that the city has changed. Upon their return, they are faced with fighting a shapeshifting, seemingly invincible monster. While exploring the city, Beast Boy spots a girl that looks like Terra and tries to jog her memory. The girl refuses to hang out with Beast Boy, but after he persists, she agrees to talk to him. Beast Boy tries to tell her that she's Terra and jog her memory, but she persists that she isn't someone who was a hero. Beast Boy later finds her stone body gone from the caves and he gets into a fight with a robotic version of Slade, who has returned, where he and Terra had their first date who insists that Terra does not want to remember him. Beast Boy makes another attempt to talk to Terra and jog her memory. She tells him that she isn't the hero he thinks she is, that things aren't how he remembers them, and that she can't be friends with him again. Terra essentially confirms her identity, but departs before Beast Boy can make any progress. He is then called to help the other Titans defeat the monster as he runs towards a bright white light.

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Villain(s): Slade, Unknown White Monster