Hypno Toad. Not only does it have a ranged attack, but it can control more than one person at a time. It could just have the extras beat up the Brain Slug controlled person.
No Contest the Br-
ALL HAIL THE HYPNOTOAD
(OK my real answer…hypno-toad in a rout)
Everybody knows that show jumped the shark in Season 3.
Can I vote for the Cordyceps?
A quick video from Planet Earth (which, by the by, is an amazing documentary, especially on a big screen HDTV with blue ray).
All Hypnotoad has to do is switch to a garlic based shampoo and win. That being said, both creatures lose to that humblest of God’s creatures…
The Tyrannosaurus Rex!
The coding on your link was broken. I fixed it tho. 
Hypno-Toad wins for being so beautiful and precious.
What about the most evil creature of them all? (Turns out it’s man.)
Why should I believe you Mobo? You’re Hitler!