Teen Titans #21
In "Citadel of Fear," the Teen Titans press on through the eerie reaches of Dimension X, aided by the enigmatic Hawk and Dove. With Robin and Kid Flash taken prisoner by the alien forces, the team faces their most perilous challenge yet—unraveling a mystery that stretches beyond their world. Written and illustrated by Neal Adams, with dynamic inks by Nick Cardy and lettering by John Costanza and Joe Letterese, this 1969 issue features a striking cover by Nick Cardy.
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The Titans continue the search for the aliens of Dimension X with the help of Hawk and Dove. Robin and Kid Flash are captured by the aliens.
Plot details indexed by the Grand Comics Database (CC BY-SA).