Aaahh!!! Real Monsters (1994)

Season 4: Episode 11

Ickis, Krumm and Oblina get trapped inside a nuclear power plant when they accidentally set off a warning device closing down the entire facility. Seeing the three monsters on a monitor, one of the plant workers mistakes them for three plant employees. A team of highly trained doctors don protective clothing and go inside the facility to bring the "employees" out to safety.