Shuti Gatva told about the greatest villain of "Doctor Kto"

The fearless Fifteenth Doctor Shuti Gatva in session of questions and answers in official social networks of "Doctor Kto" told whom considers as the greatest villain of series. Fairly, of course, would be to designate ex-shourannera Chris Chibnell, and Gatva, generally, almost and told. Crying angels, but it, of course, classics — though they indeed terrible. I would like...