The Bubble Walker is the primary mode of transportation for Krang in the 1987 TV series prior to his android body's completion.
In the episode "Four Musketurtles", some of Krang's contemporaries are seen using Bubble Walkers during a flashback. The Krangazoids also ride different-colored Bubble Walkers in "Invasion of the Krangazoids".
The Bubble Walker is a prominent accessory of the 1990 Krang action figure as well as a secondary one for Krang's Android Body's figure.
Krang pilots a much larger, but similar body in a boss fight in Teenage Mutant Ninja Turtles II: Back from the Sewers.
The Kraang Walker seen in the 2012 TV series and related media is also very similar to a much larger Bubble Walker.