Alex Raymond's Flash Gordon #2

Flash is captured and drugged into obeying Azura, but Zarkov and Dale restore his memory and escape. Zarkov completes a machine to makes Flash invisible. Flash invades Azura's palace and kidnaps Azura, but as the invisibility starts to wear off he is forced to take her into the Pit of Peril where the Death Dwarfs live. Flash and Azura appear to face a certain death, but Zarkov and Date rescue them. Grateful for saving her life, Azura declares Flash King of Kira.