This Billy look-alike alien is revealed to be a Maxatomar in the Ben 10 week alien pop-up. He made his first appearance in Ben 10 episode Ken 10"where he was one of the few children invited to Ken's tenth birthday party. Impressed with Ken's father, Ben, this alien revealed that his father is a dentist.
Similar to voicing this character,Richard Steven Horvitz voiced Billy from The Grim Adventures of Billy and Mandy, which is where this alien received his designing. The similarities are listed below.

• Huge Pink Nose
• Blue And White Striped Shirt
• Red Cap
• Orange Hair and Orange Skin