I might've found it?
From The Lost Media Wiki
https://www.youtube.com/watch?v=4j6bxUm3J7Q A youtuber I watch, Andrew Warra, just uploaded this. Is this possibly the lost pilot? I checked the script, and it seems to be so. I've uploaded it to archive.org without his introduction here: https://archive.org/details/thundermans_original_pilot (still uploading as of writing, should be done soon!)