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Gorillas on the Mast

Season 31 Episode
666 "Treehouse of Horror XXX"
"Gorillas on the Mast"
"Marge the Lumberjill" 668
"Look how happy that thing is. Lis, this is a new feeling. We helped a whale be free and now I feel wonderful."
Bart Simpson
"Gorillas on the Mast"
Gorillas on the Mast promo 1.png
Episode Information
Episode number: 667
Season number: S31 E5
Production code: YABF20
Original airdate: November 3, 2019
Couch gag: A target is placed on the couch, and the Simpson family is thrown at it for target practice. Homer is last, yelling "make way", before being thrown against the wall instead and exclaiming d'oh.
Guest star(s): Jane Goodall as herself
Showrunner(s): Al Jean
Written by: Max Cohn
Directed by: Matthew Nastuk

"Gorillas on the Mast" is the fifth episode of season 31 of The Simpsons and the six-hundred and sixty-seventh episode overall. It originally aired on November 3, 2019. The episode was written by Max Cohn and directed by Matthew Nastuk. It guest stars Jane Goodall as herself.



"After a trip to Aquatraz Water Park, Lisa becomes determined to set free Springfield's most vicious animals in captivity. Meanwhile, Homer fulfills a lifelong dream of buying a boat, and quickly realizes boat ownership sucks."


The Simpson family visits the Aquatraz Water Park, where Lisa notices how unhappy the animals are behind glasses, including a penguin funeral, while Homer notices how much fun boat owners have, remembering how much he wanted it as a kid while fishing with his father.

A boat salesman notices Homer watching the boats and convinces him to buy one. Bart, Lisa and Willie go back to the water park to free the whale trapped in it, with Bart finally understanding altruism and liking it. Homer takes the family on a ride on his boat, the Something's Fishy, and even Marge agreed it was a good idea to buy it.

The next rider on the boat is Grampa but when they return to the pier, the boat starts sinking, and Raphael offers his help as a mechanic, while Bart is sharing a plan with Milhouse to free other animals on his newfound spirit of altruism.

Homer offers Lenny and Carl to share the boat, and the expenses to fix it. Bart and Milhouse go to the Springfield Zoo and free a gorilla, Lolo, but it goes on a rampage, while Milhouse gets caught by two tigers.

Bart calls Lisa for help since the police are useless on capturing it. Homer starts co-owning the boat with even more people and the boat sinks due to the weight. The gorilla rampages at the Springfield Elementary School and Lisa stops him using Seinfeld to calm it.

Lisa brings Lolo home to help it go back to a life of freedom, then brings it to Dr. Goodall at the Pennsylvania Ape Reserve where he'll be loved. At Moe's Tavern it somehow ends well when Homer convinces the co-owners of being as good as someone who owns a boat because they owned one for 5 minutes.


International airdatesEdit

Country Date Channel Note
Asia January 12, 2020 Fox Asia
Brazil flag.png Brazil September 14, 2020 Fox Channel Latin America
Hispanic America.gif Latin America September 13, 2020 Fox Channel Latin America


Promo videosEdit