Dr. Phinneus Pogo is an advanced chimpanzee, assistant and friend of The Umbrella Academy family. It was revealed by Number Five wearing Hargreeves' monocle that Pogo had a terrible past of being experimented on.
Dr. Pogo telephoned Spaceboy at Annihilation Control to inform him that Sir Reginald Hargreeves had died. When Spaceboy arrived at the Umbrella Academy, he was greeted by Dr. Pogo who was joined by Spaceboy's long-lost brother, Number Five, who had seemed to have not aged a day. Spaceboy wanted to know where Number Five had been, but Dr. Pogo told him that the story could wait.