Hyperthermia is elevated body temperature due to failed thermoregulation that occurs when a body produces or absorbs more heat than it dissipates. Extreme temperature elevation then becomes a medical emergency requiring immediate treatment to prevent disability or death.
Who is Doomsday, and why should we care about his fight against Superman, Batman, and Wonder Woman? The latest trailer for Batman v Superman: Dawn of Justice gave us our first look at the really big, really bad muscle for the film, the monster known as Doomsday. The character/creature has a long history with DC Comics and ties to a few very significant events, namely the death of Superman.
MORE: Review: Superheroes Duke It Out Superseriously in Batman v Superman. Back to the comics: Superman eventually returns from the dead. The method of resurrection is convoluted to say the least. Superman's body is put in a regeneration machine in the Fortress of Solitude. In the meantime, his adopted father Jonathan Kent, has a heart attack.