Sesame Street Mecha Builders The series focuses on “mecha” versions of three legacy characters: Mecha Abby Cadabby, Mecha Elmo, and Mecha Cookie Monster, all reimagined as mechanical beings with the power to enlarge to giant size in addition to unique built-in tools and gadgets. The trio usually solve a problem using a three-step formula: plan, test, and solve. Later episodes would add a fourth main cast member in the form of Elmo's puppy Tango. Much like the Muppet Babies reboot, the animated nature of the show's visual style allows more expression in the characters besides body language and opening mouths.