Forgive and Forget.Heckyl launches a new plan to find the Rangers' base and take the Energems using Stingrage's venom, which has been modified to cause amnesia. At the same time, Riley's old school rival shows up in town, and Riley becomes determined to best him in an athletic contest. Snide interferes with Heckyl's plans, but Heckyl takes advantage of it and manages to infiltrate the Rangers' lab before employing a revived Stingrage to contaminate the city's water supply with his venom...