Marco's introduction allowed the Sesame writers to deal with issues of international adoption and non-traditional families. Executive Producer Carol-Lynn Parente explained the inspiration for the storyline:
“Statistics show that almost a third of children are being raised in single parent households, so we felt it was important to reflect this growing family trend on our 'Street'. By using an adoption storyline to represent the single family household, it also gives us a chance to model yet another definition of what a family is.”
- Episode 4130 - Gina Adopts a Baby, part 1
- Episode 4131 - Gina Adopts a Baby, part 2
- Episode 4132 - Gina Adopts a Baby, part 3
- Episode 4139 - "The Adventures of Gina the Veterinarian" segment
- Episode 4142 - "Real People Tales" segment
- Episode 4143 - "I Love Every Part of You"
- Episode 4145 - "Real People Tales" segment
- Episode 4146 - "The Adventures of Gina the Veterinarian" segment
- Episode 4153 - Zoe and Rosita find Abby's magic wand
- Episode 4158 - Elmo feels jealous of Marco
- Episode 4182 - "Real People Tales" segment
- Episode 4186 - Baby Bear's new babysiter / "Letter of the Day" segment
- Episode 4262 - The Latinization of Marco
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