He escaped a Kryptonian prison just before Krypton exploded.
- For some reason Hul looks completely different in his second appearance.
- In Return of the Phantoms, while they are in 1957, the criminals say that in 20 years Superman will put them in the Phantom Zone. This would be 1977. However, in 1978 when they escape from the Phantom Zone in Terror from the Phantom Zone, they say that Superman imprisoned them 15 years before. This date would be around 1963.