The Butt-Uglies are three unlikely heroes who defy their evil leader's orders to conquer Earth, and instead, fall in love with our planet and defend their adopted home against invading aliens. In Butt-Ugly Martians: Zoom or Doom!, boys can choose to play as one of the courageous Martians or one of the bad guys they have to overcome.

• B.Bop-A-Luna - The group's leader. Sharp, bright and impulsive. Sometimes guilty of not always thinking things out to their conclusion. Rough on the outside with a heart of gold.
• 2-T-Fru-T - A Tech Commando. If something needs doing then 2-T's your man (or Martian). He can make or rig almost anything! Always ready and willing, but not usually the first to try something new.
• Do-Wah Diddy - Perhaps the most levelheaded of the three Martians. Kind-hearted, soft and sensitive. He won't strike until provoked, but when he does, watch out!
• Stoat Muldoon - A professional alien hunter with his own TV show "Muldoon, Alien Hunter." He's a by the book, no nonsense kind of guy with zero tolerance towards any alien. All are a threat!
• Jax The Conqueror - An incredibly boastful soldier driven by the need to conquer. Defeated by the Butt-Uglies in a previous clash, he's mega-dangerous and out for revenge!
• Gorgon - A foul-smelling, shape-shifting alien from the Planet Gorg. He becomes extremely ferocious and easily annoyed when cornered, so Butt-Uglies beware!
• Chitzok - A powerful alien warrior employed by Emperor Bog to speed up the Martian invasion of Earth. He considers the Butt-Uglies to be weak and unworthy of the invasion, and relishes nothing more than the chance to show he's the right alien for the job.