John Janus, kidnapped and stripped of the Menthor helmet, is being used as bait to draw his teammates into an inescapable ambush. With no thought for his own survival, and despite taking multiple gunshots at close range, he manages to trigger the death trap prematurely at the cost of his own life. Witnessing his sacrifice sends the surviving T.H.U.N.D.E.R. Agents into a Roaring Rampage of Revenge unprecedented in Silver Age comics:
For a moment the THUNDER Agents stare at the lifeless body of Menthor in stunned disbelief... Then, as one, they turn... There is no need for words... With blazing eyes Dynamo bursts through the wall as if it were paper... The THUNDER Agents fight in silent, savage fury, giving no quarter... and the green men and their mindless slaves are forced back... Ever back, until there is no longer any retreat... Only extinction!!