When did Transformers Portal Season 1 Episode 3 air?
Transformers Portal Season 1 Episode 3 aired on September 5, 2016.

Transformers: Portal (Трансформеры Портал Transformery Portal) is a licensed animated web series exclusive to Russia, which began in September 2016. Designed by Marvelous Group, the series depicts a crossover between the 2015 Robots in Disguise and Titans Return franchises (https://tfwiki.net).
The mysterious Observer arrives in our world. Who is it? What is its purpose? You just have to find out... (Youtube)
Direct answers for episode-level questions and details.
Transformers Portal Season 1 Episode 3 aired on September 5, 2016.
This episode runs for approximately 3 minutes.
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