An American Tail: The Treasure of Manhattan Island

The story begins as it returns to New York City sometime after the events of the first and before the second movie, as Fievel and Tony discover that an ancient treasure lies underneath Manhattan when snooping around an abandoned subway (the Beach Pneumatic Transit system) and stumbling upon the remains of a dead mouse clutching a treasure map, deciding they must find it with the help of an archaeologist Tony knows: Dr. Dithering, along with fighting five villains as well.

The movie focuses on the relationship between the over-exploited workers of a sweatshop (in this case, a cheese production line) and the factory's robber baron owners: Mr. Grasping (Ron Perlman), Mr. Toplofty (Tony Jay) and Mr. O'Bloat (Richard Karron). The treasure under Manhattan turns out to be a group of Lenape mice living a long-distance beneath the surface (far below the sewers) that decided to hide when they saw how the first Europeans only brought war and disease with them and didn't want to wait for the European mice to do the same to them.

The sachem, Chief Wulisso (David Carradine), decides to send his daughter Cholena (Elaine Bilstad), to the surface to see if they have "changed their ways." Upon their return, Scuttlebutt (John Kassir) (one of the members of the expedition to find the treasure) reports to the villains unbeknownst to the rest of the members of the expedition, who then decide to use this to their advantage. They lie to all the workers of the sweatshop about Cholena (obviously not by name), telling them that she is their enemy. The corrupt mouse police chief, McBrusque (Sherman Howard), and Scuttlebutt scavenge every nook and cranny until they find her. After the angry mouse mob try to capture Cholena and anyone else involved with her, Fievel and his friends decide to take Cholena back underground before being put in further harm's way, but the police find out and go after them.

Meanwhile, everyone finds out about Dr. Dithering's friendship with the Indian and take him to the butcher shop for his execution. Papa tells everyone about how madness like this is why they all left for America and should work together to become friends with those different from them as the fellow Americans they are. Tiger the orange tabby cat saves Dr. Dithering from the villains, who escape and order McBrusque and his men to find and kill the Lenape mice.

Upon returning Cholena to her home, they tell the chief what is happening. McBrusque, Scuttlebutt, and the other police officers show up to the village, but the Chief, the Native Americans, Fievel and his friends drive the villains away. The chief gives them a gunpowder bomb to collapse the tunnel connecting the Native Americans to the outside world. But before they can do so, they are ambushed by the enraged McBrusque and Scuttlebutt who attempt to get revenge on the Mousekewitz children and Tony once and for all, but the two crooks are overpowered and Fievel manages to set off the bomb. This floods the tunnel, together with McBrusque and Scuttlebutt as they fall into the chasm to their deaths. Tony and Tanya managed to reach higher ground, but Fievel is seemingly carried off by the current.

When the water recedes Tanya and Tony desperately search through the mud to find him, before giving up. But just then, Fievel breaks through the surface, and all three share a muddy group hug, thankful that everyone survived.

The movie ends with Fievel's papa forming a worker's union and the villains agreeing amongst themselves that they're forced to negotiate with "that riff-raff" to avoid a strike. Meanwhile, Tiger is enjoying his new job as the police chief. The last scene is Fievel seeing, through a foldable telescope, Cholena and her father disappearing into a hidden door at the foot of a statue, which pleases Fievel.

• Thomas Dekker as Fievel Mousekewitz
• Lacey Chabert as Tanya Mousekewitz
• Nehemiah Persoff as Papa Mousekewitz
• Erica Yohn as Mama Mousekewitz
• Dom DeLuise as Tiger
• Pat Musick as Tony Toponi
• Elaine Bilstad as Cholena
  • Leeza Miller as Cholena's singing voice
• René Auberjonois as Dr. Dithering
• David Carradine as Chief Wulisso
• Ron Perlman as Mr. Grasping
• Tony Jay as Mr. Toplofty
• Richard Karron as Mr. O'Bloat
• Sherman Howard as Police Chief McBrusque
• John Kassir as Scuttlebutt
• Dave Mallow as additional voices

Following a six year hiatus for the An American Tail series, Universal kicked off a $15 million marketing campaign to reignite interest in the franchise with re-releases of the first two films leading up to the release of An American Tail III with the fourth installment scheduled for the following June. The mandate for the series as dictated by then President of Universal Worldwide Home Entertainment, Louis Feola, was to "...to create the same value and success for An American Tail as the studio did with the Land Before Time (series)".[2]

In addition to three original songs, archive music from the first two films are reused.

All tracks are written by Michael Tavera.

Advertisement of the third movie shown inside the cover of the 1998 reissues of An American Tail and An American Tail: Fievel Goes West.

The Treasure of Manhattan Island received the VHS release for the United States and Canada on February 15, 2000.[4] Prior to the North American release, it was advertised on 1998 reissues of An American Tail and Fievel Goes West. It was later released on DVD on January 20, 2004, with a sing-along version of "Anywhere In Your Dreams" as a bonus feature. It was later combined in a DVD set packaged with three other movies on June 13, 2017.[5]

Robert Pardi of TV Guide gave the film 2 out of 5 stars and wrote: "Although the bright and bubbly animation lacks depth, these cute little vermin have just enough personality to make tykes unaware they're being spoonfed ethnic-harmony aphorisms".[6] Susan King of the Los Angeles Times wrote that young children under 10-years-old might find it entertaining.[7] Grace Montgomery of Common Sense Media felt that the politically sensitive elements depicted in the film are "out of place for An American Tail" and recommended that "your kids would be better off to stick with the original An American Tail and skip this one".[8]

• An American Tail: The Treasure of Manhattan Island at IMDb