Top of the Line is a canceled episode. It had a script that, unfortunately, wasn't recovered from Viacom and Nickelodeon.

Details are unknown since neither the script or audio were ever finished and/or released. In the Fan Q&A section of the Medium-Sized Book Of Zim Scripts (Vol.1) , Eric Trueheart says that this episode would have included an appearance from Tak.

Little is known about the episode. What is known, however, [citation needed] is that there would be a SIR competition (presumably an arena battle or a series of challenges), which GIR wins and in the process destroys all the other competing SIRs except two. [citation needed]

The purpose of the competition is presumably to prove which Invader was superior to the others. [citation needed]

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