K·9

Robot Gladiators (1x21)

Air date: May 31, 2010

Darius and K-9 go undercover to expose a criminal who is using illegal robot technology in what he calls “destruct-ertainment”. K-9 becomes a Gladiator and has to face the evil “pain-maker” in a battle to the death. But what is the sinister secret plan instigated by Thorne?