Avengers Spotlight (1989 series) #26

The supervillain known as the Wizard is taken to the Vault, the maximum security prison for superhuman criminals. Guardsman Frank Ensign is assigned to escort him to his cell and explain the rules of the establishment. Once in his cell, Wizard discovers another, disguised person there (spoiler: it’s Loki); the one-sided conversation is picked up by the monitors and Frank goes over to investigate. He discovers the Wizard in his gadget-laden costume able to fight back. Wizard defeats Frank and releases all the prisoners from their cells; the Guardsmen head to the scene only to come face-to-face with a formidable gang including Mr. Hyde, Armadillo, Electro, and Scarecrow. In the office they discover the cables to the power plant have been cut and the silent alarms have been disabled. An automatic call to the Avengers has, unknown to anyone at the Vault, been diverted to the offices of Damage Control. Frank is able to repair his helmet radio and send a message to the Avengers, which is picked up by Peggy Carter, before he passes out again….