Black Thunder is a Bull that Ambush battled in the movie. Black Thunder was the 2019 runner up in the baddest of the bulls competition. Black Thunder is possibly 2000 pounds and (much like every bull) is aggressive against robots. Ambush was able to defeat Black Thunder but was distracted and Black Thunder broke Ambush's leg, then wrecked Ambush into pieces.
- Black Thunder is the only robot challenger that is not a robot himself.