Originally posted by NephthysSuperman and kryptonians had to hold their breath when flying space for extended periods of time in the 80's 90's depending on which retcon cycle, they would power up supes and eventually ignore or explain why superman can survive longer in space without air.. he oxygenates his blood or recycles the oxygen in his body which was learned from Mongul Jr..
Did Kryptonians always need to hold their breath?Can't they like, fly through space and stuff?
