Here's a shot of Octophantom (a Zyu2 monster that Lord Zedd created back in Season 2) on Onyx.
Here's a shot of Sinister Simian (a KakuRanger monster) playing the piano on Onyx.
Here's some more shots.            
Here's a shot of some creature playing a game.
Here's a shot of 2 creatures playing the same game.
Here's 2 shots of 2 beings getting ready to play whatever that game is.  
Here's another shot of a being playing the game.
Here's a shot of a being aiming a weapon at the cloaked figure.
Here's another shot of Onyx. You can see Marvo the Meanie (a KakuRanger monster) among the background creatures in this shot.
 
Here's a shot of the Cloaked Figure after Darkonda has spotted the Morpher he's wearing.
Here's a shot of the Cloaked Figure being by Marvo the Meanie. In the background you can see what appears to be Psycho Yellow's Monster Form.
Here's some shots of the Sword that Andros grabs.  
Here's Darkonda on Onyx.  
Here's another shot. The monster to the left of the shot was apparently Marvo the Meanie but it was just a back shot of him.
Here's a shot of Darkonda on Onyx but outside of the Tavern.
Anything involving Onyx is new footage.
Here's some Piranhatrons on Onyx.
Here's another shot.
Here's another shot.