User blog comment:CaliforniaKingsnake/Top 10 Most Shocking Robots/@comment-26043001-20170324165907

I know it's hard for a lot but I think Tornado would be a good candidate. Seriously, remove the domination it had in later series. When it arrived in Series 4 it was a box on wheels no one assumed anything of.

Also an obvious one is Stinger's dream run in Series 4

S3 maybe considering the previous two stings were naff

Iron Awe 2.1 especially since the previous versions fell flat