Superboy and Impulse decide that the perfect way to cheer up their depressed buddy Robin is to go into Gotham and fix things up. It's a mistake they quickly learn to regret when they find themselves needing help in fending off the bizarre plant woman called Ferak and the Kobra strike force that's closing in.
Lagoon Boy stumbles upon Kobra submarines while heading for Gotham. At the same time Batman has banned Robin from entering Gotham with everything going on in the city since the quake. So Impulse and Superboy decide to head to Gotham to help, Robin chasing after them. Once there the two boys run into one of Poison Ivy's plans, while Robin picks up Lagoon Boy, before meeting up with them to help in the fight. Batman shows up to help finish the job and kick them out again. Before they get too far out of the city, Lagoon Boy tells them about the Kobra ships in the water and with the help of his friend Blubber, easily take out the army before they get to their destination.