"My friends! You asked me before, what my name is. I did not tell you because I no longer felt like myself, you know? But, you brought me back! You made me whole again! My name, is Pablo! Pablo Marinus, once and future hero of The Great War! And I am going to save the UNIVERSE!"
— Pablo Marinus leaving Siberia and being sent back in time to fight the Great War.
Pablo Marinus was one of the first initial test subjects captured by Group 935 and kept in Siberia, alongside Takeo Masaki and Nikolai Belinski. During his time in captivity, Pablo would constantly have dreams of himself as a noble knight, fighting in "a great war" alongside four ancient heroes, as a result of exposure to Element 115. Eventually, he was thought to be dead after Edward Richtofen and Harvey Yena performed an experiment which removed one of his spleens. He was later replaced by "Tank" Dempsey.
Unbeknownst to Richtofen, Pablo managed to survive, but he found himself in a pocket dimension resembling the Siberia facility, and is unable to escape, while zombies roam the area. Pablo took refuge in the nearby lighthouse, and continued to survive for the next 20 years, until he met with a groupofragtagsurvivors. Realizing that these survivors can help him achieve his goal, he gives them a series of tasks in order to construct the Agarthan Device, allowing him to travel to The Great War and fulfill his destiny.
When Pablo arrived at the Great War, he assisted Primis in fighting the Apothicons, and quickly learned of Doctor Monty, as well as his plan to perpetuate the never-ending cycle in the Multiverse. Pablo managed to defend Primis Richtofen long enough for him to activate a teleportation mechanism, allowing him to reach Alcatraz Prison in the future and prevent himself from following Monty's plan. Before Richtofen left for Alcatraz, Pablo gave him the elemental gem from the Staff of Fire to aid him in his efforts. It is unknown what became of Pablo afterwards, or his status following the collapse of the Multiverse.
"My name is Pablo, or at least I think it is or was, I don't know anymore. I have been locked away, held prisoner in this cell for many months by German scientists. They keep experimenting on me, pumping me full of some blue liquid. I think it is responsible for the repeated visions I have been having, which I swear look and feel real. In my vision, my name is Pablo Marinus and I am a knight coming back from the Crusades. I fight in a great battle against strange, demon like creatures who are trying to devour the Earth. At one point, it appears I am doomed, trapped in the tentacles of a great, three headed beast, when suddenly, four knights decimate it with magical elemental staves, saving me from certain death. There are other worldly creatures that fight on our side against the demons. The creepy thing is that the sigils on their tunics resemble the ones I noticed on the stones here at the castle as I was being brought to my cell. I just hope I can eventually find a way to escape this place."
— Pablo describing his experiences as a prisoner and the visions he had when tested with Element 115.