Panic in the Mailroom

Two Minions (Ken and Mike) are working in a package room to send parcels through different parts of the lab, while Ken is busy playing a handheld video game. When a package containing expired PX-41 (the serum that El Macho used to transform the Minions and himself in Despicable Me 2) gets jammed in the pneumatic delivery system, it transforms Mike into an evil Minion- but he keeps shifting back and forth, much to Ken's amusement. At the end, Mike spits out the PX-41 and it lands on some cats, turning them evil.

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S01E07 - Training Wheels