Color: Red
Gender: Male (UK), (Female in US version prior to 2015)
Catchphrases: "Muck to the rescue!" and "Let's get mucky!" (Original Series)
"Oh, wow! I'd love to join in!" (reboot series)
Voiced by: Rob Rackstraw (UK; 1998-2012)
Lachele Carl (US; 2001-2009)
Sophie Aldred (US; 2010-2012)
Paul Panting (UK; 2015-present)
Vincent Tong (US; 2015-present)

Muck is a cross between a bulldozer and a dump truck. Muck is a continuous tracked dump truck with an added bulldozer blade. He often acts before thinking and subsequently gets in trouble for it.