Great! I like Sentinels of the Multiverse and this is a pretty cool take on it; do you mind if I give a little feedback on some of the heroes' moves though?
Legacy: Danger Sense seems way over-powered, as it gives them +2 every time they make the Rescue move; I simple can't think of a situation in which you can take action to rescue someone who isn't present. How about "Take +2 to rescue someone else if it is your first action upon arriving at any scene", implying that your supersenses have lead you there for that purpose. The advanced move should then be the usual "Take 10 for free when you make this move."
Bunker: The Adhesive Foam Grenade move seems pretty cool, but I'd just make it so that on a 7-9, the target gets stuck in addition to whatever other consequence you choose; the advanced move as given is too powerful, since it gives you a permanent free Take 10 anytime you Rescue someone, so change it so that your targets no longer get stuck when making this move.
Tachyon: All cool, except Blinding Speed appears twice.
The Wraith: The only move I'm not sure about is Stun Bolt: when I get a hit, do I stun the target in addition to any other effect? And what is 'stunned'? How does it differ from incapacitated? Also, the advance seems pretty powerful, so that even a miss becomes a hit, but that depends on what effect being stunned has.
Absolute Zero: I'm really impressed: that's a great use of the existing moves and rules to reflect the nature of this particular hero and the new moves you've come up with complement the concept perfectly. I'm tempted to edit the Frost's Wall of Ice move so that it freezes foes who fail to escape: great idea!
Please let me know how it goes whenever you get a chance to try this out: any and all feedback welcomed, as always!