The Shape Shifter is an obstacle, first introduced as the fifth and final obstacle in the Qualifier of Season 3, replacing both the Fender Bender and the Swing Set from the previous season. It was interchanged with the Fling Set throughout the season.
It is a vertical spinning disk with three shapes: a circle, a square, and a triangle. Contestants must get through one of the shapes in the disk and land on the finish platform.
There are different objects in each episode that must be used to reach the disk:

Season 3’s Shape Shifter (with trampoline)
- In episodes 2 and 6, there was a trampoline that contestants must use to bounce through one of the shapes to the finish platform.

Season 3’s Shape Shifter (with zip-line)
- In episode 3, there was a zip-line that contestants must use to swing across the water and through one of the shapes to the finish platform.

Season 3’s Shape Shifter (with diving board)
- In episodes 7 and 16, there was a diving board that contestants must use to jump through one of the shapes to the finish platform.

Season 3’s Shape Shifter (with swing)
- In episodes 11 and 13, there was a swing that contestants must use to swing across the water and through one of the shapes to the finish platform.

Season 3’s Shape Shifter (with slide)
- In episodes 9 and 18, there was a slide that contestants must drop down and through one of the shapes to the finish platform.
Only three contestants cleared this obstacle:
- Burton Hendrickson (S3E2)
- Frank Beasley (S3E11)
- Rico Curtis (S3E16)
It was replaced by the Yule Log Jam in Season 4's Winter Wipeout.