Mortimer appears to be the smartest monster.
He is very calm and shy. Like all the other monsters he hates witches, and also usually doubts everything.
Appearances
Summer Camp Island
Main cast, played by Bobby Moynihan
- Episode 1x02: Monster Babies (Jul 7, 2018)
- Episode 1x15: Monster Visit (Jul 7, 2018)
- Episode 1x16: Ice Cream Headache (Jul 7, 2018)
- Episode 1x21: Cosmic Bupkiss (Jun 23, 2019)
- Episode 1x23: Director's Cut (Jun 23, 2019)
- Episode 1x25: I Heart Heartforde (Jun 30, 2019)
- Episode 1x33: Puff Paint (Jul 14, 2019)
- Episode 1x36: Midnight Quittance (Jul 14, 2019)
- Episode 1x39: Spell Crushers (Jul 21, 2019)
- Episode 2x01: Meeting of the Minds (Jun 18, 2020)
- Episode 2x02: Ava's Yard Sale (Jun 18, 2020)
- Episode 2x04: Tortilla Towel (Jun 18, 2020)
- Episode 2x05: Acorn Graduation (Jun 18, 2020)
- Episode 2x18: Tumble Dry Low (Jun 18, 2020)
- Episode 4x03: Breakfast Like Gene Kelly (Jun 17, 2021)
- Episode 5x10: Oscar and the Monsters Chapter One: Unaccompanied Oscar (Dec 9, 2021)
- Episode 5x11: Oscar and the Monsters Chapter Two: Tiny Outburst Society (Dec 9, 2021)
- Episode 5x12: Oscar and the Monsters Chapter Three: Witches' Brew (Dec 9, 2021)
- Episode 5x13: The Babies Chapter One: Breakfast Errands (Dec 9, 2021)
- Episode 6x15: CHAPTER FIFTEEN Croissant Moon (Sep 24, 2022)