NanoZim begins with GIR coming home drinking through a straw from a cup labeled "Suck Monkey". He leaves the door open when he comes in and allows Dib to sneak in and take a picture of Zim, which in turn sets into motion a bizarre and hilarious Incredible Voyage type excursion as Zim travels into Dib's body to remove the knowledge from Dib's brain of where he hid the photo. Dib manages to get a nano ship of his own and swallows it so he can battle Zim, but ironically after Zim disables Dib's arms Gaz takes the controls and easily defeats Zim.

This is the first episode where Gaz has a large role and this episode does quite a bit to develop her character (whether threatening Dib with bodily harm or pummeling Zim with her video game skills).

My Favorite Moments:

I think my favorite moment of this episode was GIR sucking his face inside-out trying to drink his Suck Monkey. There were several other good moments (Dib's finishing move, arms like limp noodles), but that one shines out above the rest.