Starting on February 6, 2021, the official Ghostbusters YouTube will be posting full episodes of The Real Ghostbusters weekly on Saturdays.
On February 3, 2021, it was announced on the official Ghostbusters YouTube the channel will also post episodes of Extreme Ghostbusters on Wednesdays. The start date is to be announced.
Link to Ghostbusters YouTube
If you need a refresher on either series:
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