Darkseid is the leader on the plant of Apokolips. He is bent on taking over the earth and having his revenge against Superman for defeating him one time. He leads his army against the earth and battles against the Justice League.
Darkseid not only is the ruler of an entire planet, but has a lot of power just on his own, too. He has super strength and endurance that almost matches that of Superman, eye beams that will destroy anything they hit and are guided towards their target like a tracer and has many tools to use if his opponent starts to beat him.
His ultimate ambition is not only to take over the earth but the entire galaxy, which definitely makes him one of the more ambitious villains, truly a force to be reckoned with.