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Such an obvious concept, I wonder why no one had thought of it before? A toddler with a kryptonite pebble could give Superman or Supergirl instant arthritis, so why not just build an entire container out of it? I suppose it would be like making a jail cell out of asbestos, since the entire cage would be simultaneously killing any Kryptonian that was inside it. Thanks to a 1966 issue of Action Comics from DC Comics, we get to see Brainiac using such an entrapment, and we get to see Supergirl, the beautiful girl known as Superman’s cousin, caught in a Kryptonite trap, facing kryptonite peril.
The story begins with Superman having to leave the planet and leaves Supergirl with the responsibility of protecting the entire planet by herself. This superheroine, despite not even being a member of the Justice League, is left with this superhero burden. The villain Brainiac shows up with a flying saucer, so naturally Supergirl needs to investigate. He is actually looking for Superman and threatens to blow up Metropolis if he doesn’t show up. Supergirl does what she and Superman always do, which is to try to solve the problem with their superpowers and fists. When she tries to attack the flying saucer, its force-field knocks her all the way to the ground where she lands in an alley. Supergirl persists in her attempt to stop Brainiac as he tries all sorts of tactics, including a time-travel-ray in an attempt to knock her into the far future.
Eventually Brainiac has no choice but to use a Kryptonite cage that he prepared for Superman. He first stuns Supergirl with a super powerful ray, and then snap-shuts the cage over her using remote-control magnets. The result is that we see Supergirl captured in a Kryptonite trap with no way out, her blonde hair disheveled as she faces her greatest vulnerability. To be extra-sure that she dies, Brainiac increases the radiation and releases Kryptonite gas, intensifying the superheroine’s pain. And finally, he blasts the cage and its contents with unimaginable power, disintegrating everything. The glowing rock of Kryptonite surrounds Supergirl, leaving her in a weakened state and seemingly defeated.
Despite being so thorough, Supergirl still manages to escape. In her desperation and struggle against her weakness, she simply slips through the bars. Since the cage was intended for Superman and not her, it was easy for her to leave, though not without enduring significant hurt from the Kryptonite exposure. Brainiac escapes into another time-era, leaving Supergirl to recover from her ordeal. This perilous encounter showcases the vulnerability of even the mightiest superheroes when faced with their specific weaknesses.
If you would like to read this thrilling tale of Supergirl’s rescue from kryptonite peril, you are going to have to get (Affiliate Link) Action Comics 339 and add it to your collection. This was back when comic books gave you real value by providing more than one story. The stories also would be told to completion in one issue, rather than spanning across multiple comics and multiple titles, forcing you to either pay a small fortune to collect them all or just wait for the graphic novel to come out.
Supergirl’s Kryptonite Vulnerability

Supergirl, a beautiful girl with blonde hair, is one of the most iconic superheroes in the DC Comics universe. As Superman’s cousin, she shares many of his superpowers, including super strength, flight, and heat vision. However, her greatest vulnerability is kryptonite, a glowing rock that can weaken and hurt her, putting her in a state of peril.
In many stories, Supergirl finds herself captured by villains who exploit her weakness to kryptonite. These villains often use elaborate traps and laboratories to ensnare her, causing her great pain and desperation. Despite her incredible powers, Supergirl’s struggle against kryptonite highlights her vulnerability and the constant threat she faces.
The kryptonite trap is a common theme in Supergirl’s adventures, showcasing her as a superheroine in distress. Her weakened state in the presence of kryptonite adds depth to her character, making her more relatable and human. The struggle to escape from these perilous situations often leads to dramatic rescues and thrilling battles, where Supergirl’s resilience and determination shine through.
Supergirl’s encounters with kryptonite also emphasize the importance of her allies and the support she receives from other superheroes. These moments of weakness and defeat are crucial in her journey, as they test her limits and ultimately make her stronger. The ongoing battle against kryptonite peril is a testament to Supergirl’s enduring spirit and her unwavering commitment to protect the world from evil.