Marshmallow is Peter Walter VI's pet cat from the 8th Dimension.
Marshmallow is giant, white, fluffy cat similar in appearance to a Persian cat. He towers over both the humans and automatons and is large enough for Peter Walter VI to ride.
- Marshmallow is fed in the 8th Dimension every Friday
- According to Rabbit, Marshmallow's litter tray is the size of a football field.