X-Nico

Baby Wildebeest

In "Calling All Titans," Wildebeest was shown to have been flash-frozen by the Brotherhood of Evil alongside Hot Spot.

Brotherhood of Dada

Though they would be considered villains by most definitions, the group does not recognize concepts of good and evil (hence the decision to rename themselves from the Brotherhood of Evil), but simply aloof; they are perhaps best described as anarchic rogues.

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Mister Morden, first name unknown, longed to reform the Brotherhood of Evil.

Ding Dong Daddy

He first appears in the episode "Homecoming, Part 2" as part of the assembled villains gathered by the Brotherhood of Evil to fight the Titans.

Elasti-Girl

Tragedy strikes when the Doom Patrol's enemies, the Brotherhood of Evil, threaten a small New England fishing village.

Garguax

Garguax returns in Doom Patrol #96, this time allying himself with the Brotherhood of Evil.

General Zahl

Madame Rouge had previously succeeded (also apparently) in destroying the other members of the Brotherhood of Evil.

Gnarrk

Later they are part of a group of reinforcements that come to rescue Beast Boy, Pantha, Más, Herald, and Jericho from the Brotherhood of Evil in "Titans Together".

H.I.V.E.

Most of the H.I.V.E. students later became allies to the Brotherhood of Evil and ended up frozen by Más y Menos.

Kole

They both become Honorary Titans, but Kole believed she would be safe from the Brotherhood of Evil, as no one knew about their location underground.

Madame Rouge

As Madame Rouge, De Mille became the only female member of the Brotherhood of Evil, and assisted the Brotherhood in its continuing conflicts against the Doom Patrol.

Monsieur Mallah

Now known simply as the Brain, the scientist and Mallah gathered together the criminal organization known as the Brotherhood of Evil in hopes of conquering the world and getting revenge on Caulder.

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After the remaining Titans arrive in time to collectively combat the Brotherhood of Evil, Mallah instead requests for them (Brain and himself) to "take their leave", to which the Brain calmly mocks Mallah for his 'cowardice', as well as ordering him to "put an end to this nonsense", leaps down onto the arena, 'swats' away Gnarrk and Cyborg as they charge at him, and is once again confronted by Bobby, which Mallah presumably spends the majority of the battle's duration fighting.

Pantha

Pantha joined the team of Beast Boy, Más, Herald and Jericho to launch an assault on the Brotherhood of Evil's main headquarters, and then took part in the final battle against the various supervillains assembled by the Brotherhood of Evil; in said battle, she defeats a rival Mexican super-powered wrestler in league with the Brotherhood and claims his mask as per the code of Lucha Libre.

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She was then attacked by Adonis and Atlas whom were sent by the Brotherhood of Evil, but defeats them both.

Plasmus

He then made a cameo, along with his fellow minions, as an ally of the Brotherhood of Evil.

Psimon

In the Teen Titans animated series, Psimon appears in Season 5 as one of the recruits of the Brotherhood of Evil.

Titans East

They also make several cameo-like appearances while battling the Brotherhood of Evil in the "Calling All Titans" and "Titans Together" episodes, which mark the end of conflict between the Brotherhood and the Titans.