Base found on Pinterest!
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Short summary of the episode called "Human error pt. 1" (I only watched a little bit of it, so I didn't dive into it too much from the Transformers wiki page to get spoilers :v);

On Christmas Eve, Optimus Prime is patrolling the city. He sees Soundwave toys running everywhere, some of which have suspiciously glowing red optics. He decides to return to base where Sari is making oilnog for them. In the base, a Soundwave toy, which was smuggled in as Bulkhead's present, uses some sort of electric device on the oilnog Sari has made. The Autobots drink it and find that it makes them disorientated. As one, they decide to take a stasis nap.

The next morning, Optimus and his crew realize they have become organics, but Ratchet can find no logical explanation for their transformation. Prowl is the only one who is not particularly concerned by his new form (which resembles his human hologram, mustache, and all), but the others are horrified. They start wondering what happened to their original bodies and decide to go to Sumdac Tower on foot.
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Lunara did find the taste of the oilnog a bit weird, but she didn't want to hurt Sari's feelings, so she had small drinks of it. Lunara did have a freak out as well, but she slowly liked her human form, despite it feeling weak at most times.
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