Dorrie is an ally to Mario, Luigi, and the inhabitants of the Mushroom Kingdom. Dorrie appears to resemble a blue plesiosaur with a head similar to Yoshi's. Dorrie mainly helps Mario and friends to cross certain water.
Super Mario 64/DS
Dorrie first appears in Super Mario 64, where he can be found inside of an underground cave in Hazy Maze Cave. Dorrie happily gives Mario a ride when he needs to. Dorrie swims around in circles continuously. He can also be controlled depending on which way Mario faces on which Dorrie copies. When Mario Ground Pounds Dorrie's head, it lowers.
There is a sign in the cavern that states that Dorrie can eat you, but in the actual game, Dorrie is completely harmless.
New Super Mario Bros.
Dorrie reappears in New Super Mario Bros. as an ally to Mario and Luigi by crossing toxic waters in World 4. Like Super Mario 64 DS, they possess goggles. If Mario or Luigi Ground Pounds on Dorrie, Dorrie swims faster.
Mario Party 3
Dorrie appears in Mario Party 3 during the item mini-game called Dorrie Dip (with the setting being Hazy Maze Cave from Super Mario 64). In the mini-game, several items are seen on a raft (along with the Koopa Kid). The player must Ground Pound him on the back to make him pick up a raft. If Dorrie picks up an item, the player will win that item, but if Dorrie picks up the raft with the Koopa Kid on it, the player will lose.
Mario Party 5
Dorrie appears in Mario Party 5 in the mini-game of Tug-o-Dorrie where the Dorries are plastic in the colors of red, blue, green, and yellow. In this game, players must pull their opponents off their platforms with ropes. The last one-three standing win.
Mario Party Advance
Dorrie appears in Mario Party Advance, where he is lonely as he says that he scared away Mr. E and wants a new dinosaur friend. Yoshi must come along and befriend Dorrie so he can get the Soil Sonar from Dorrie. The show Dorrie saying that Yoshi ought to visit him soon as he has not seen him in a while.
It is implied that there are many Dorries, as they are referred to as a species in this installment of the Mario series. Like how they are many Yoshis.
- Despite a warning sign saying to beware of Dorrie since he can eat some people if they come too close, Dorrie appears to be harmless and behaves altruistically toward Mario and the others.
- Dorrie appears to be based on Nessie, the Loch Ness monster