iBomber has a plot like every Steven Seagal movie since Under Siege; it’s there, just barely, and serves only to string the locations together and provide some context to the slaughter. This is nothing new and I’m sure we’re all used to action games being written on the backs of napkins in expensive Hollywood bars.
What plot there is follows first the Allied forces and then the Axis, through missions that attempt historical accuracy in their little briefings but give up entirely in execution. Again this isn’t much of an issue and it’s actually nice to be given some context; many TD games consist of: “Here base. Bad guys will come. Use turrets and such”, giving players little to no actual reason to progress. In this respect iBomber should be praised.