Automatically casting animation at start of battle?

[Yawgmoth]

Hi all,

So I have a party size of 4. I want only the party leader to be visible at the start of combat and perform the casting action while an animation appears beneath party member 2, 3, and 4 making them suddenly appear and then the animation stop. I want all of this to take effect before the action command window appears. Can this be done? If so how?

Thank you for any help.