- All Quiet in the Big Harbour - Hank defies an order to be quiet in order to prevent an accident.
- Theodore to the Rescue - While trying to rescue Digby, the disaster-prone cable ship, Theodore ignores some danger warnings and gets himself into trouble, too.
- A Joke Too Far - Theodore and Barrington hide from the others as a practical joke, but things get a little out of hand.
- Theodore and the Ice Ship - While helping a mysterious ship laugh off its icy appearance, Theodore and Hank learn that you can't judge a ship by its hull.
- Big Harbour Fools Day - George misses out on the fun of Big Harbour Fools Day by taking himself too seriously.
- Grumpy Garbage Barge - Theodore realizes the importance of smiles after spending a day without them in the company of Guysborough the Grumpy Garbage Barge.
- Theodore Hugs the Coast - Theodore gets lost outside the Big Harbour, but finds his way back by remembering to "hug the coast" and take things one step at a time.
- Hank's Hiccups - Hank tries everything to get rid of a bad case of hiccups.
- Hank's New Name - Hank wonders if he would be treated like a bigger tugboat if he had a bigger name.
- Theodore and the Northern Lights - Though impatient with them at first, Foduck finally learns to appreciate Kulu the Canoe's tales of magic and mystery.
- Big Harbour Birthday - The other tugs trick Theodore into thinking they've forgotten all about his birthday.
- Theodore's Backwards Day - Theodore has to ask for help when he discovers that he can't move forward.
- Scally's Stuff - A charming new container ship named Scally dazzles everyone with his flashy haul, but they soon learn that what glitters is not always useful.
- Theodore's Big Friend/Theodore and the Stubborn Ship - A lonely container ship helps Theodore see that everyone—big or small—shares the same feelings.
- Emily and the Missing Barge/Theodore and the Missing Barge - When a set of bumpers goes missing, the tugs jump to conclusions about what happened to it.
- Theodore and the Borrowed Bell - Theodore doesn't want to tell what he knows about Northumberland Submarine's missing bell because he doesn't want to get a friend in trouble. But the longer he keeps quiet, the more complicated things get.
- Emily's Close Call - After an interesting-looking container turns out to be dangerous, Emily learns to be more careful about what she picks up.
- Emily's New Hat - Emily feels better after finally telling the Dispatcher the real reason she doesn't want a new hat.
- Emily and the Tug-Of-War - George tries to convince Emily that she can't participate in a tug-of-war because she's a girl.
- Theodore and the Lost Bell Buoy - Foduck warns Theodore not to spin bell buoys, but Theodore ignores the warning—then loses his way because Bedford Buoy is not there to help him.
- Theodore and the Boat Bully - Theodore is excited about welcoming a new tug to the harbour—until he realizes that Oliver the Ocean Tug is a bully.
- George and the Underwater Mystery -George's project of raising a submerged satellite doesn't go too well—until he realizes that he can't just give orders and expect everyone else to do his work.
- R. Boat and the Queen - Theodore helps a very gloomy rowboat learn to look on the bright side of things.
- Hank and the Night Light - While his dockmate, Theodore, is away, Hank gets scared of the dark and realizes that it's OK to want a little help from a night light.
- Theodore and the Pirate - A rumor that a pirate boat is hiding in the Big Harbour gets everyone on full alert—but just how reliable is the source?
- The Dispatcher
- Phillip and Filmore
- Benjamin Bridge
- R. Boat
- Rebecca (does not speak)
- Kingston (cameo)
- Rodney (mentioned)
- Henry Eben
- Colchester (not named)
- Louise (not named, does not speak)
- This season marks the final of a couple things:
- This is the final season dubbed in Swedish, Finnish, Norwegian and Danish.
- Which makes it also the final Season to have episodes dubbed in languages other than english.
in Other Languages
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