Mavis is a female Diesel.


Season 1 - Mavis and the Lorry and Fire Engine (mentioned)

Season 2 - Toby's Megatrain (does not speak)

Season 4 - Light Work (cameo) and Diesel's Big Idea (does not speak)

Season 5 - Rusty to the Rescue (cameo)

Season 6 - Oliver in Charge and Resource and Sagacity (cameo)

Season 7 - Mountain Engine (cameo)

Mavis will be be appearing in Season 10.

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