Adventure Time/Recap/S06/E22 The Cooler

After a natural disaster hits the Fire Kingdom, Flame Princess (voiced by Jessica DiCicco) is forced to team up with Princess Bubblegum. Unbeknownst to Flame Princess, Bubblegum set up the cooling in order to infiltrate the Flame Kingdom and deactivate the kingdom's Sleeping Fire Gods, extremely powerful and ancient weapons of mass destruction. Once Bubblegum's betrayal is known, the two princesses fight, resulting in destruction of all but one of the Fire Gods. Flame Princess calls Bubblegum a bad person, to which she protests. Eventually, after intense discussion, Flame Princess reveals her actual name — Phoebe — to Princess Bubblegum as a sign of friendship. Princess Bubblegum, in turn, pulls the plug from her extensive surveillance program.

(Recap copied from Wikipedia, "Adventure Time (season 6)")


 * Deadly Dodging: How PB gets Flame Princess to destroy the Sleeping Fire Giants.