Invader ZIM (2001)

S1E5 NanoZim

Dib successfully captures a photo of Zim without his disguise, prompting Zim to devise a scheme to shrink himself to a microscopic size. His goal is to infiltrate Dib’s body and erase his memory of where the photo was taken. Luckily for Dib, his father has been developing a gadget that could assist him in thwarting Zim’s plan just in time. However, Dib must tread carefully, as he is in a precarious situation with Zim now inside him, making him highly susceptible to Zim's intentions.