For this dream team I used some of the most evil and deadliest of supervillains in the fictional universe, in a team like this there wouldn't actually be a team captain just four evil doers working together to wreak havoc upon the universe! But because the contest also makes me choose a team captain for me it had to be my favourite supervillain of all time....
THE JOKER (Batman)
The Joker is a serial killer and a super-villain, a dangerous madman who dresses like a clown and commits violent crimes. He is often recognized as Batman's greatest enemy, living in and terrorizing Gotham City, although he spends most of his time in Arkham Asylum. In addition to being a deadly and unpredictable physical combatant, he is a brilliant and ruthless criminal mastermind. His crimes require no motivation other than his sadistic desire to show people the meaninglessness of life through pain and death, and the narcissism to see the world remade in his own image.
DR. DOOM (Fantastic 4)
The Latverian Monarch known to many as Doctor Doom was born brilliant. In a deal with the devil, his mother sacrificed her soul in return for her son to be a ruler. He spent much of his life studying both dark magic and science, only to have his plans continually foiled by meddling superheroes. As monarch of Latveria, Doom's rule is dealt with a heavy hand. Between his time platform (the first known time machine on Earth) and his doombots (robotic replicas of himself with artificial intelligence), Doom is a brilliant inventor and scientist. While at the same time, he is one of the most powerful sorcerers in existence, making him easily amongst the most dangerous villains on Earth.
Skeletor is the most evil being and most dangerous threat on Eternia. His only goal is power, and to that end he will not rest until he possesses the secrets of Castle Grayskull, whereby he could become master of the universe. This places him in direct conflict with the only man powerful enough to stop him, He-Man
DARTH VADER (Star Wars)
Darth Vader was the Sith title given to Anakin Skywalker by Supreme Chancellor Palpatine after he embraced the dark side in 19 BBY after struggling against its grip for several years. Palpatine lured Anakin to the dark side when he promised to protect his wife, Padmé Amidala, from the death Skywalker had foreseen for her in his dreams. Skywalker buried all good in himself and, at the command of his new master, led the 501st Legion to the Jedi Temple, killing every single Jedi inside, including the younglings. The personalities became further distinct when Anakin suffered great physical and emotional damage that completely changed his appearance and character. As Darth Vader, Anakin became a powerful asset to the fledgling Empire, serving as an enforcer, Jedi hunter, Supreme Commander of the Imperial Fleet, and general Executor of Palpatine's will.