Undergrowth is the main antagonist of the Danny Phantom episode "Urban Jungle".
He is a giant weed plant ghost-like monster who wants to enslave humanity as revenge for their endless destruction against nature and one of Danny Phantom's greatest enemies.
Universal Horror Show of Circus Gothica[]
Undergrowth is among the ghosts that Freakshow puts under his plans for the Greatest Horror Show in the multiverse
He secures Big City in vegetation as part of the plans Freakshow has
Under Freakshow, Undergrowth goes after Lincoln, Lydia and their friends in their own trek as they go hunting for the ghosts under Freakshow's control. He takes control of vegetation life and uses Molly for his own ends which takes the others to free her.
Undergrowth escapes getting sucked in and imprisons everyone in New York with his vines leading to Wile E and The Ghostbusters working to get out.
He gets into a tussle with Slade's ghost allies who refuse to sell out the others to the other ghosts and Freakshow
In the end, Undergrowth is sucked away with the other ghosts to be put into the Flows of Failed Phantoms under Scratch