Episode 4 was the fourth of fifteen episodes which covered Season 1.0 of Comedy Central BattleBots. With fights spanning three different weight classes, six more robots looked to advance in their respective division. Canadian Derek Young and his stompbot Pressure Drop took on Subject to Change Without Reason in the middleweight bracket, while lightweights Mouser Mecha-Catbot and Shaft did battle. Later on, Las Vegas 1999 champion Vlad the Impaler squared off against Donald Hutson's dynamic heavyweight, Tazbot. The episode premiered on September 13, 2000.