Nova (Truth, Justice, and Scooby Snacks)

 Nova  is the pet horse of supervillain, Terra-Man.

Physical appearance
Nova is white with a white mane, wings, and gray hooves. He wears a brown reign.

Personality
It has a mean demeanor, suggesting it's just as evil as Terra-Man.

Powers and abilities

 * Flight
 * Breathe in the vacuum of space

Scooby-Doo! Team-Up
It was prepared to stomp Superman while Mongul held the latter, but Mongul and Terra-Man's bickering allowed for Superman to fling Mongul into Terra-Man and Nova.

Appearances

 * Scooby-Doo! Team-Up
 * #9. (no lines)