Unseen Aliens

Alien 	Status
Sandbox 	Mentioned in Ken 10
Snakepit 	Mentioned in Ken 10
Shellhead 	Mentioned in Ken 10
Rocks 	Used off-screen
Squidstrictor 	Used off-screen
Decagon Vreedle	Confirmed by Derrick J. Wyatt
Thriller Whale 	Scrapped, possibly still canon
Ventrilosquid 	Scrapped, possibly still canon
Mr. Mucky 	Official art revealed
Charcoal Man 	Mentioned in Store 23
Copy Copy 	Mentioned in And Then There Was Ben
Dog-Nabbit 	Mentioned in Store 23
Fascat 	Confirmed by Derrick J. Wyatt
Feedback 	Mentioned and icon shown in Store 23
Giant-Manster 	Mentioned in Store 23
Muck-A-Muck 	Mentioned in It's a Mad, Mad, Mad Ben World Part 1
Orbit Man 	Mentioned in It's a Mad, Mad, Mad Ben World Part 2
Rath 	Confirmed when Ben used Ben 23's Omnitrix to change into Rath
Teeny-Weeny 	Mentioned in It's a Mad, Mad, Mad Ben World Part 2
Windy-Hindy 	Mentioned in It's a Mad, Mad, Mad Ben World Part 1