Adventure Comics #394

From DC's June 1970 run of Adventure Comics, issue #394 drops Supergirl right into the middle of a full-blown prison cafeteria riot — guards leveling ray guns from above while numbered inmates bang cups and shout "We want food!" as an armed, green-clad figure points a weapon directly at her. The cover, penciled by Curt Swan and inked by Murphy Anderson, frames Supergirl as both the accused instigator and the calm center of chaos, with the bold tagline "Heartbreak Prison — Where Every Girl's a Lifer!" making it impossible not to flip to the first page immediately.