Isabelle is a cargo ship who visited the Big Harbour a few times. Not much is known about her.
- Season 2 - Theodore's Whistle (cameo), The Tugboat Pledge (cameo), Snorri the Viking Ship (cameo, has Elo Echo and Olympia's superstructures), and Emily the Vigorous (not named, does not speak, has Elo Echo and Olympia's superstructures)
- Her hull was previously used for Caroline, and was later used for Linda.
- Her superstructure was recycled from Margaree Pride, William B., and Margaret, and was later used for Annapolis.
- In Snorri the Viking Ship and Emily the Vigorous, Isabelle has Linda's superstructure for some unknown reason.
- Isabelle is seen in the intro.
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