Oliver Grayson I is one of the unseen characters who were mentioned in Invincible. He is the late father of Debbie Grayson and the maternal grandfather of Mark Grayson/Invincible.
His daughter named his step-grandson after him.
Appearance[]
His appearance is originally unknown. As he does not appear in the series. But except for the fact, his skin color is normal as his daughter's skin was, and he has white hair when he was old.
Personality[]
His personality is originally unknown. Except for the fact, he was the father of Debbie.
History[]
Nothing much known about his backstory. Except for the fact he had a child name Debbie.
Legacy[]
Oliver died from unknown causes. In 2002, Debbie would meet a Viltrumite named Nolan who would later get married and they would have a child born in 2005 named Mark Grayson, a Viltrumite-Human hybrid. But years passed to late 2024, Debbie would name her stepson after her father.
Sightings[]
| Season 2 | ||||||||||||
| 1. "A Lesson For Your Next Life": | Absent | 5. "This Must Come as a Shock": | Absent | |||||||||
| 2. "In About Six Hours, I Lose My Virginity to a Fish": | Absent | 6. "It's Not That Simple": | Mentioned | |||||||||
| 3. "This Missive, This Machination!": | Absent | 7. "I'm Not Going Anywhere": | Absent | |||||||||
| 4. "It's Been a While": | Absent | 8. "I Thought You Were Stronger": | Absent | |||||||||