WARNING! Jr. was a supposed featherweight version of WARNING!, possibly competing in the Featherweight Championship of Series 3. However, the series was never seen due to WhammettNuht's computer messing up.
The only evidence of WARNING! Jr. existence is during a clip of Abaddon being showcased. Also in the fight were Panic Attack Jr. (a featherweight version of Panic Attack) and The Yankee. Unfortunately, the clip featured was after WARNING! Jr. was flipped out of the arena (it was not in the arena during the clip) evident by its control board blacked out, thus WARNING! Jr. was never seen so it is unknown what it looks like, but it seems obvious that it is just a scaled-down version of WARNING!