Hypersonic Speed: Give this character a power action and move it up to its speed value; it adds 2 to its d6 roll when breaking away and can use [May move through squares adjacent to opposing characters, but still needs to break away normally]. During this move, this character may, as a free action, make one close combat or ranged combat attack with its range value halved for the attack. This character must be in a square where it could legally end its move in order to make the attack.

SHAPE CHANGE When this character is chosen as the target of an attack, you may roll a d6. On a result of 5 or 6 , the attacker can’t target this character with an attack this turn and the attacker may choose another target character instead. The attacker then makes the attack unless there are no targets, in which case the action resolves without an attack.

If the character with HSS (0 range) during the movement passes adjacent to more than one enemy character (A,B and C no adjacent between them). If "A" gets a successful Shape Change roll when he is chosen as the target of the attack, can the attacker choose B or C?

So, you have to pick a square to make the attack from (per HSS).

That's the square.

If you can make a CC attack against a second target from that square, then, if they make the SC roll, you can change targets.

So, if you can't, too bad.

If you declare that you're making a RC attack from the square, you may have a better chance at picking an alternative target if they make the SC roll.

I don't think you get to pick a square, they make the roll, and then you say, "nevermind, I pick a different square" for the second attempted close combat attack.

Yes. All Shape Change does is prevent the HSS character from targeting THAT character; in this regard, it is no different than attacking a Shape Change character with effects other than HSS. Just pick a different target.

However, it is worth pointing out that you MUST be able to target this new character from the same square. If your HSS character would have to reposition to make the new attack, it can't be done. And it MUST be the same kind of attack; if you had previously declared you were targeting A with a ranged combat attack, you can't now choose to attack B with a close combat attack.

BTW - I've captured a picture of your avatar - if I ever get tired of having Nimrod as my avatar, it's DARKSEID all the way.

OT: Why do a ton of people abbreviate this power as HHS?

I'm not picking on the OP or anything about this. I'm generally curious because I've seen many people use that abbreviation.

Most people say HSS (Hypersonic Speed).
I could even see HS (Hypersonic Speed). I don't recall anyone ever calling it that. (Technically speaking, that's probably a better abbreviation.)
I'm just missing where the second H is coming into play when people call it HHS.

I heard Darkseid has cookies....or something like that.

err - something like that ... perhaps the alternate spelling ...

I responded with HSS ... agree, HHS is perhaps the name of a ship?!?!?!

For me, I saw DHHS, Department of Health and Human Services. But, that's my field, so...

I'd argue that since you didn't make the attack, you didn't choose the square.

if you didn't choose the square, I haven't had the requirement to make my SC roll.

You chose the square - it's part of how HSS works.

To make an attack, you have to (a) be in a legal square and (b) declare the type of attack and the target(s) of the attack.

If you haven't done this, I don't need to make a SC roll.

So you've picked a square.

You must choose a square before you can declare an attack, which you must do before you target a character, which you must do before your opponent can roll shape change, which he must before he destroys your hope and dreams.

Here's a question - does hypersonic speed make you commit to a ranged or close combat attack prior to the shape change roll?

Let's say my hypersonic attacker can use giant reach, and commits to making a close combat attack against a character with shape change from one square away. Similarly, a character with IT: can shoot out of adjacency commits to an adjacent square and a close combat attack.

If the intended target succeeds on their shape change roll, and another character is within range/LoF, can I decide instead to make a ranged combat attack? Or have I committed to close combat?

Pretty sure you're committed to making an attack from that square, so you could declare CC attack, have their SC roll succeed, say, ok, now a RC attack against this other target, and that would be legal.

As long as you can make a ranged combat attack while adjacent to another figure, which generally isn't a "thing".

2014 Core Rule Book, page 11:

So you would need someone who is allowed to make a ranged attack while adjacent to an opposing figure who also has HSS. How may figures have sharpshooter (or a similar trait) and have HSS?

Very few:

Star Trek: Tactics III
Tactical Cube 138

Marvel Avengers Assemble
Steve Rogers 061

The Invincible Iron Man
029b War Machine

DC Man of Steel
016 General Zod

That's all the results that the units section produced for a Sharpshooter/ HSS combination.