Atom cannon

An atom cannon is a fictional weapon featured in the Flash Gordon multimedia franchise. It appeared in the story "Adventure in Opto" from Four Color #173 in November, 1947. The atom cannon was developed on the planet Opto and was utilized by Regent Optik in his battles against the resistance cell led by Vango. The cannon was extremely destructive, and was capable of generating large mushroom clouds at the site of its targets.