- Boris as Arthur
- Miffy as D.W.
- Miffy's Mom as Jane
- Miffy's Dad as David
- Aggie as Francine
- Brobee (from Yo Gabba Gabba) as Buster
- Melanie as Muffy (Both Start With A M)
- Muno (from Yo Gabba Gabba) as Binky
- Plex (from Yo Gabba Gabba) as Brain
- Snuffy as Pal
- Miffy's Sister as Kate
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