just read the description
we are number one but 'we are number one' is replaced with donald trump meme. The number of trump memes played increments by one each time 'we are number one' is meant to be said until sportacus gets trapped in a cage. From then onwards the trump meme is played in reverse and instead decrements by one each time. If the number of trump memes played goes below 1, a short clip in which jimmy neutron says 'the pizza is aggressive' will play one time instead, regardless of the decrementing value determining the number of trump memes.
Robbie Rotten is played by Stefan Karl, who was recently diagnosed with pancreatic cancer. If you have the money or the time please donate to his GoFundMe page here:
https://www.gofundme.com/2tm9tqk