Igloo is an oil tanker who helped the tugs out when Clare was beginning to leak oil.
- Season 3 - Theodore to the Rescue (cameo), Theodore and the Northern Lights (cameo), A Joke Too Far (cameo), Big Harbour Fools Day (cameo), Hank's New Name (cameo), Big Harbour Birthday (cameo), Theodore's Backwards Day (cameo) and Theodore's Big Friend (not named, does not speak)
- Season 4 - Hank's Wheezy Whistle (cameo) and Rebecca and the Big Snore (cameo), Theodore's Prize (cameo), George and the Navy Ship (cameo)
- Season 5 - Theodore and the Harbour Crane (cameo) and George's Big Hurry (does not speak)
- Igloo's model was also used for Kingston.
- Igloo's model is currently on display at Maritime Museum of the Atlantic, but is now in the character of Kingston.