In the beginning of the movie, Captain Cold has set up an array of satellites with the intention of freezing the world. Batman and Robin fly up with Cyborg and Superman to take them out, and get intercepted. Batman ejects from the Batplane to help Cyborg manually disarm one - leaving Robin behind - only to be caught by Bizarro. Upon seeing Batman in trouble, Robin takes control of the Batplane (taking out the autopilot with a Robin-arang in the process), rams it right into Bizarro and flying both the plane and Bizarro into the satellites, taking them all of them out in a titanic explosion that he ejects from just in time. Never wonder why they call him the Boy Wonder.
Karate Kid and Dawnstar make ready to make a Last Stand against the Time Trapper without help from the Justice League. Just as Time Trapper is about to finish the pair, a familiar voice interrupts him.
Dawnstar defeats the Time Trapper. The battle itself is brief, with Dawnstar basically slamming into Time Trapper while lit up. Forcing him to drop the Hourglass, thus taking away his ability to alter time.
Karate Kid winds up taking on half the Legion of Doom by himself to buy Dawnstar the time to continue searching for their objective. Not only does he successfully fend off three supervillains, each of whom was giving a member of the Justice League a good fight, but he ends the battle by punching a glacier out of existence.
The moment Superman lands the finishing punch on the Time Trapper's face.
.