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| PERFORMER | Tyler Bunch voice |
| DEBUT | 2017 |
Marty Monsterberg is Grover's cousin. He first appeared in the 2017 Sesame Street in Communities digital storybook Monster Moments, where he and Grover look through a few photo albums capturing milestones and moments from his first five years.
Animated appearances[]
- Furry and Blue Family Celebration: Marty and other members of Grover's family have a virtual meal together. (YouTube)
- Take a Break, Take a Breath, Try Again: Grover helps Marty calm down before attempting to tie his shoes. (YouTube)