Does anyone know this cartoon? I dont!?

Okay so there is this cartoon an it has a guy with blone hair that is spiky and he is with his sister and he is friends with this green alien and a caveman that wears like hawaiian clothes. It was on cartoon network i believe either before or after totally spies. It was like the same animation. My little brother watches it and for some reason i was trying to remember it and i cant! I dont think it plays anymore though... Does anyone know? Please help?