During an overnight construction Rex and Ace can't sleep. Meanwhile Max and Chomp sleep perfectly. The two get in a fight. Max calling Rex uptight, and Rex calling Max clueless. Then an Ankylosaurus appeares in a subway train station in Japan, with the same problem Rex and Ace had last night. The D-Team and Ursula, Zander and Ed try to capture it, but Rex and Ace got separated from the D-Team. Ed summons Tank to capture it but when Zander activated Dino Swing, Ankylosaurus used Mole Attack to defeat Tank. Ace (after getting attacked by its Mole Attack move) won the battle against the Ankylosaurus, and the D-Team captured it. Max and Rex make up and becoming best friends once more.