Just theorycrafting, sorry, but are all your chars at range except tank and rogue? If so, one bubble and clear bubble off you should stop one fear. One dispel from priest should stop one if you get lucky. One fear ward should stop a fear. And one free action potion should stop a fear I think. Just let the rogue wander around if you have enough DPS already.
Well, from what i have read on wowwiki, the AOE fear has a range of 40m. So I pick a spot to tank him, back the healer up to ~39m with the mage right next (41m range for Fireball) and the lock ~4m in front of them. Then I fear ward the pally, pull and nuke, and move the dps back when i think he is going to fear. When i see the rogue get feared i move em back up and attempt to repeat.

Problem is, the fear is fairly unpredictable, and when i don't move soon enough heals and ranged dps get feared, and bam, healer is out of range of tank, dps is facing the wrong way, tank is dying. And the best part is, by the time i can get them all in range again, he usually drops another fear. I hadn't considered trying the free action potion, I will definently make some of those up. I will also make a few macros for the priest to dispel tank/dps. Thanks for the tips!

For the mind control, can you dispel it (priest)? Can you free action potion it? You can't bubble out of it, probably cause of loss of control of your char. But can the rogue stun lock you? Vanish, cheap, gouge, wait....kidney. That should be 3 points easy (even if he doesn't do any special moves). Would that be enough time to give you time for it to wear off? What about the lock fearing you? In ST Jammal will MC someone, find out what people do there. In SFK, Argul will MC someone, what helped in there. If MC is a shadow spell (go to Thottbot.com and check boss, then check spells he uses and then check spell to see if physical or shadow), you might use priest shadow resist thingy and maybe a shadow resist potion and/or just a shadow resist ring or neck to try to resist it.
As for the mind control, he MC's all 5 toons at once and make them fight each other. The only ways I know of to minimize damage is for the mage to iceblock right before it happens (5 min cooldown), and for the lock to have the succy out because there is a good chance it will just seduce someone. The issue with this fight isn't so much staying alive, its just getting back in range and setup quick enough to dps before the next MC (I believe it is on a 45 second cycle). The boss himself hits like a wet noodle and even a clothie can take a few hits without too much worry.

As far as resistances, I do not think that it can be resisted at all, its just part of the encounter.