OK, I'm looking at getting a Darkseid and if it's not Crisis, it's SM. I'd like to determine how well Darkseid works with one of my favorite figures and how he works with a newer one I want. Let's start.

BOOM TUBE INVASION: Darkseid can use Phasing/Teleport. When he does, he can use the Carry ability to carry up to 3 characters regardless of their speed symbols. One character of 125 points or less that shares a keyword with Darkseid and was carried by him this turn may be given a non-free action.

So if used with Aragorn's Epic Action, listed here;
THROUGH THE WILD: Give Aragon an epic action and all friendly characters can use Leap/Climb until your next turn. At the end of your turn, one friendly character per 100 points of the game's build total may be given a move action as a free action if they have not been moved or placed this turn.

If Darkseid uses Aragorn's Through The Wild to Boom Tube Invade, is the <125 figure still able to take it's non-free action? I'm thinking not, but I'd like confirmation.

Just curious. If anyone can help out, I'd greatly appreciate it.

No, because Aragorns effect happens at the end of your turn. You can't activate any non-free action at the end of your turn.