The Diabolical Masterminds of Series 6 (1968-9)
Incarcerated years before by Steed, Kafka springs from prison after sending his henchmen on ahead to clear the way - Steed is trapped in a ministerial recuperation facility called Department S, and wheelchair-bound. He bribes Carson, one of the medical staff, to kill the guard on the main gate and destroy the defences so none of the patients can escape, then moves in by helicopter for the kill - but he hadn't counted on Tara's resolve or Steed's cunning, and they are all defeated.
Board member of a large construction company, the greedy Seagrave sought to gain total control by killing off his fellow board members. He tricks old music hall performers, disgruntled by the company closing down their theatres, into doing the killings but his merry crew of vaude-villains are no match for "Gentleman Jack" Steed and the death-defying Tara.