Currently there are a whole host af randomly created aliens, including turrets, created on loading a map. The turret is probably as a result of that - if you can find the code that does it (at work at the mo, so can't point it out for you) you should be sorted.
Speaking of which, can you remove that random aliens code for the next update Rob? I think the spawners we have (and can create) take care of aliens now without needing any random ones.
Speaking of which, can you remove that random aliens code for the next update Rob? I think the spawners we have (and can create) take care of aliens now without needing any random ones.