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Scummy Onion-Bot is an evil robotic onion. He has a splatter of mold on his lip and is peeling from various layers. One of his eyes is replaced with a metal patch that gives him a mechanical eye instead, while one of his arms is replaced with a blaster gun.
- Scummy Onion-Bot is the second full onion Grossery, with the first being Onion Scum from Series 1.
- He is exclusive to both the 2 in 1 Rotbot Assault Vehicle and the 2 in 1 Gross Glow Assault Vehicle, along with Horrible Horn.
Putrid Pear-Bot / Off Egg-Bot / Slime Apple-Bot / Stinky Cheese-Bot / Muck Muffin-Bot / Carrot Slop-Bot / Burp-rito-Bot / Burger Slop-Bot / Tomato Rot-Bot / Soda Grot-Bot / Sick Chip-Bot / Crappy Cabbage-Bot
Cyber-Slop Pizza / Space Jump Pumpkin / Scummy Onion-Bot / Unknown Sandwich Rotbot