No one has time to play with Speed, though. Speed admits that he doesn't know how to relax. Sparky suggests fishing. When Sparky demonstrates, he reels in a huge piece of seaweed. Speed hooks a monster crab.
Speed chases it away with a blowtorch.
While Barnum is counting his profits from the rollerdome, Dez calls with a report that all the first formula mutagen has been dumped into the ocean and has created a giant crab and giant seaweed. Racer X tells Speed that giant creatures have been seen offshore of Fontana Central, too. He also says that Internet suspects that Largo Sludge is behind the mischief. Pops has called his friend, Dr. McAllister, who thinks she can create a genetic stabilizer to counteract the mutagen. Speed and Trixie volunteer to get the necessary sample of sea water.