without context i can't help you as much, but i will give you blank deffinitions of the things [not sure if mutant is in my dream book though]
a shark can mean anger, hostility, and rage, if you're going through an emotional time this is saying you might be snapping at people, or you're giving yourself a really hard time. anoher option, the shark could be a person in your life who is greedy, or it's an aspect of yourself you wish to avoid.
water represents your spiritual self, your state of mind, and your inner balace. depending on if it's calm or not, or if it's muddy/clear warm/cold it can change the meaning. if it's calm you are in tune and at peace, if it's choppy, then you're in a state of emotional turmoil.
doll, a common dream actually, when they come to life you're trying to escape childhood things, become someone else, or escape present problems or responsibilites. if there's a bunch of dolls just lying around, then it's your childhood and you wish to get away from it. if you're playing with them, you're not comunicating with your contious and unconcious mind.
spiders, i'm gonna interpret if the spider was just there, not if it was eating a bug or spinning a web. you feel like an ousider, or you wish to keep your distance in a situation. another symbol of the spider is an overbearing mother figure.
sorry, my book doesn't have anything on mutants, perhaps it's got something to do with change and being unable to hide these things?