Gerry Anderson's New Captain Scarlet (2005)

S1E3 Swarm

The Angels take down a USAF transport plane en route to Skybase, but it manages to release a horde of cyberbugs—small, advanced robots that can consume metal and multiply rapidly. Once these creatures infiltrate Skybase, they begin munching their way toward the atomic reactor core. If Scarlet doesn’t discover a weakness soon, the entire headquarters will face annihilation.