Is this worm good or bad to plants

I found many of these worms in my soil. I grow vegetable in 5 gallon bucket. Yesterday I found many of this kind of worm in my bucket of soil. Are these worms good or bad for my plant. Would they come out of soil and worm up to my plants eat them?

It's very hard to tell when they are young like that.  

What I usually do is ask the guys at bugguide.net.  I take a picture of the grub (often with a coin or ruler next to it for scale), then grab a handful of soil, a few grubs and put them in a jar/container with some air holes. When they hatch out into adult bugs, more pictures (with a coin or ruler), and send it off to the bug guide people.  It's free and the longest I've had to wait for identification is 4 minutes.  Those guys are amazing!

Those are June bug grubs, probably you recently tilled that area?  They will  eat large holes in your potatos and carrots, but do next to no damage to anything else.  On a positive side they are a sign that your soil is healthy and full of organics, just that it hasn't been worked in a long time,   I started a new garden in a old hayfield last year that hadn't been tilled in 25 years or more, it was full of those grubs,   but I had an amazing garden besides the damage to about 30% of the potatoes and carrots

What kind of plants are you growing?  What is your climate like?

Many types of beetles have similar looking larvae to that one.  June bugs, Japanese Beetles and many other look almost the same at that stage of development.  I feed them all to the chickens when I come across them.  I'm sure most are harmless but I can't just pass up free chicken food.  It might be worth checking out what types of beetles are common in your area and then taking note of what they eat.  If you're growing grapes, and you live in an area that gets lots of Japanese Beetle damage, you might decide to kill the grubs when you see them.  You can also set a flock of chickens loose on freshly tilled ground to help knock down their population.  Chickens are suck good grub hunters.

Looks like Japanese beetle larva.  Not good guys.

Am I wrong to think that the only good worms to have around for soil and the wellbeing of plants are earthworms?

I'd like to echo Michaels diagnosis, as I think they are japanese beetle grubs also. They eat roots, and the mature adults can damage fruits & vegetables and the leaves.

My second potato bed was full of them when I harvested the potatoes.  The bed was unused last year which may be the reason this bed had so many while the other old bed beside it had none.  I found myself wishing I had chickens again or even the little mixed breed dog we adopted who loved to eat them.  I chucked them into a bucket of water to drown and then when I watered my plants the next morning, the little carcasses added a bit of organic matter.

my chickens definitely think they're good. haven't asked the plants.

There are good bugs out there too, maybe fire ants?, lady bug yes, spiders?, praying mantis?

Yup! Those are nettle grubs. They did a number on my lawn last year. They ate the roots and killed the grass. I put out nematodes for grubs and I haven’t had a problem since. Also, nematodes will work for several years after you put them in.

I have them in my mulch. I haven't opened the bag yet. I  was going to put the mulch around my flower garden. should I just get rid of the mulch?

They are actually grubs not worms.  They are the larvae of Christmas beetles and are really good for aerating soil and converting vegetation into  high nutrient casts. Plus, if you are game, they are highly nutritious.