Just a side note: I encourage you all to take a look into what slime molds are and can do. These funky single-cellular, tens-of-centimeters long and multinuclear protists are something a sick 50's horror would feature. They show signs of intelligence, despite their lack of any organs they can coordinate their movement and inner processes, they can schedule all their nuclei to divide at the same time (across these huge bodies!) and they are pretty hard to kill - cutting, shooting or stabbing won't really do.
Start here, continue here and follow wherever you like. Post comments with more info on these living foams!
Peace,
out.
Adam