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Iris Wildthyme y Señor Cientocinco contra Los Monstruos del Fiesta was the eighth story in the anthology Iris Wildthyme and the Celestial Omnibus. It was written by Cody Schell.


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  • Iris mentions Venus, ancient Pangea and the planet Zwen.
  • Señor 105 refers to oro, plomo, cobre, and plata; Spanish for the elements gold, lead, copper, and silver respectively.


  • The title for this story is written in Spanish. Translated to English, it reads, "Iris Wildthyme and Mister 105 vs the Party Monsters".
  • This story introduces Señor 105, who would later go on to star in Señor 105 & the Elements of Danger and The Periodic Adventures of Señor 105.
  • Señor 105 does not have a mask for silver out of respect for one of his colleagues. This is a likely reference to El Santo, who was known as "El Enmascarado de Plata".
  • This story is set during the 1968 Olympics. However, there are some anachronisms between the DWU and the real world:
    • Señor 105 says element 105 was recently discovered and named hahnium. While element 105 was first synthesized in April 1968, the name hahnium was proposed in 1970 by a different team of scientists. Iris knowns the element will be named dubnium in 30 years; this happened in 1997.
    • Señor 105 refers to recent geological findings indicating an impact causing the extinction of the dinosaurs and created the Chicxulub Crater. The real-world discovery started in the 1960s but was left unpublished until an independent discovery in 1978.