Super Duper Super Sleuths is one of three Winnie the Pooh films based on the short lived series My Friends Tigger and Pooh. In this film, Winnie the Pooh, Darby, and Tigger

Tigger

Tigger is a fictional tiger-like character originally introduced in A. A. Milne's book The House at Pooh Corner. Like other Pooh characters, Tigger is based on one of Christopher Robin Milne's stuffed animals...

 are out in the Hundred Acre Wood

Hundred Acre Wood

The Hundred Acre Wood is the fictional land inhabited by Winnie-the-Pooh and his friends in the Winnie-the-Pooh series of children's stories by author A. A. Milne...

 one night, stargazing. They see a shooting star fall to the wood, but are too sleepy to go look for it. The next day, they get get a call from Rabbit who claims his vegetables are giant. They eat these giant vegetables and get super powers.

This is the fifth Winnie the Pooh film to feature Lumpy the Heffalump

Heffalump

A Heffalump is a type of fictional elephant in the Winnie the Pooh stories by A. A. Milne. Heffalumps are mentioned, but never appear, in Winnie-the-Pooh and The House at Pooh Corner and later featured in the animated The New Adventures of Winnie the Pooh and Pooh's Heffalump Movie...

.