Doctor Arthur Grable was a brilliant aerospace engineer who died in a ghastly car accident and whose head was then frozen in liquid nitrogen, preserving it for future revival. He was the talented identical twin brother of the mentally disabled Roland Fuller.
At a young age, Arthur Grable was separated from Roland Fuller. However, Arthur was later able to find Roland and get him a job as a cleaner at a laboratory where he worked. Arthur never revealed to Roland the nature of their relationship; because of Roland's diminished mental abilities and Dr. Grable's extensive facial hair, Roland never realized.
Using some kind of psychic connection, Arthur was able to affect Roland's behavior from beyond the grave. Using this connection, Arthur motivated Roland to continue Arthur's work and kill the colleagues who had stolen and taken credit for his revolutionary jet engine designs. (TXF: "Roland")