Sonar, the Neron-enhanced metahuman who was defeated before by the combined power of Green Lantern and Flash, is back for revenge, and he has control of the island prison filled with super-villains known as the Slab.
Sonar, the Neron-enhanced metahuman who was defeated before by the combined power of Green Lantern and Flash, is back for revenge, and he has control of the island prison filled with super-villains known as the Slab.
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