At first, Cryos just wanted to kill Zero for embarrassing him and halting his progress on his mission to take over the entire universe, Zero made him waste lots of time and resources on a single destroyed planet with nothing useful on it. After they traveled back in time however, Cryos is furious at Zero for making him lose everything he had taken over in the future, plus Zero is stopping him from taking over other planets as well. Zero doesn't take Cryos as a very serious threat, at first he was only using him for entertainment. Zero's attitude changes when Cryos threatens the Earth and the universe in the present, he's not going to let Earth or any other planet turn into a desolate wasteland like in the future he was released in
Boob lol
