X-Men: The Animated Series: Enter Magneto

After Beast's trial, Sabretooth demands that Beast be set free, prompting the guards to shoot and injure Sabretooth. Cyclops aids Sabretooth and brings him to the Mansions' infirmary. Later, Magneto attacks a military missile facility. As the X-Men arrive, Magneto is preparing to launch nuclear missiles in order to ensure a war between mutants and humans. Cyclops, Storm, and Wolverine face off with Magneto, but are unable to stop him. Later Storm uses her wind and lightning to cause the missiles to short-circuit, deactivating them and drop them into the water. Having prevented a nuclear war, the X-Men return home to the mansion having learned the full power of Magneto.