Muck the Dump Truck
Colour: Red
Gender: Male (Female in US, Greek, Bulgarian, Brazilian Portuguese, Swiss German and Korean versions)
Catchphrases: "Muck to the rescue!" and "Let's get mucky!"
UK Voice Actor: Rob Rackstraw (1999-2011)
US Voice Actor: Lachele Carl (2001-2009), Sophie Aldred (2010-2011), Rob Rackstraw (singing voice in "Fix it Up"; 2006)

Muck is a red caterpillar-tracked dump truck with an additional bulldozer blade. Muck is one of the heaviest machines and gets very clumsy for certain things. Muck is especially fond of getting dirty, hence the name.