Board Thread:General Discussion/@comment-3974711-20140312151712/@comment-24812000-20140516194114

Basically, the aliens yet to appear of Ben's that we know are:

Spitter

Sandbox

Snakepit

Shellhead

Rocks (Even though there are no plans for him)

Squidstrictor (Even though there are no plans for him)

Portaler (Even though he's not canon)

Ventriolsquid (Even though he's... I'm not really sure because all they said is "He isn't in this... I've said too much.")

I think of all of them, Portaler could appear, Ventrilosquid probably will in And Then There Was Ben, and Spitter could appear because we saw Ben having him in the Ultimate Alien Theme Song. I know this is only because we physically saw him in the episodes Ben 10,000 and Ken 10, but he does nees to appear.

Also, I think Shellhead will appear because we know something about him. We knew Toepick was gross and Atomix was awesome from Ken 10.