Undying Summoning Sickness

[beaudetious]

If my opponent kills one of my blocking, say, Young Wolves (undying 1/1).  It immediately becomes untapped and gets a +1/+1 counter on it.  But I understand it has summoning sickness ( since it changed zones).

So, now it's my turn.  Does this creature still have summoning sickness?   Or does that end of any player's turn?

[BadLuckIrish]

No it does not have SS for it is the second turn u own him

[BlackJester]

Creatures have summoning sickness if you haven't controlled them since the beginning of your turn. In this case you did, so they can attack.
If they {Shock} your wolf on your turn before combat, you won't be able to attack.