Avengers #244

« And the Rocket’s Red Glare »: Responding to suspected extraterrestrial sabotage at the Kennedy Space Center, the Avengers confront a group of terrorists called the Rocketeers, who escape under cover of a disabling mist. Unknown to the heroes, the Rocketeers are disguised alien Dire Wraiths posing as space center technicians. When they stage a second assault, the Avengers deduce their true identities and capture them. One Wraith, disguised as the scientist Dr. Cather, escapes in an experimental ion-drive rocket, unaware that its unstable engine is about to explode.