Aaahh!!! Real Monsters (1994)

S4E11 Nuclear and Present Danger

Ickis, Krumm, and Oblina find themselves ensnared in a nuclear power plant after unintentionally triggering a security alarm that locks down the entire site. A plant worker, spotting the trio on a surveillance screen, mistakenly identifies them as new staff members. In response, a specialized team of doctors dons protective gear and enters the facility to rescue the supposed "employees," unaware of the monsters' true identities.