On its last leg homeward, from Pearl Harbour (Hawaii) to San Diego, the USS Constellation hosts a jolly ‘tiger cruise’ for USNavy, Marines and USNAF relatives, mainly minors (‘Navy brats’). Attitudes and emotions vary from simple joy to open frustration, the worst brat being XO commander Gary Dolan’s daughter Maddie, who wants him to refuse a promotion to command for a shore job. Then the news of the WCC terror crisis changes everything, as the crew is recalled to war footing.

After the mayor uses a potentially dangerous substance to protect the local plantation, the lakeside town of Mountview, in California, is attacked by a lethal species of large cockroach. After some of the town’s inhabitants are killed, the mayor enlists the help of eccentric pest exterminator General George S. Merlin in order to prevent further harm to the local dwellers.