The official Teenage Mutant Ninja Turtles YouTube Channel is an excellent resource for free content. While it may not always host every single episode for free indefinitely, it frequently provides:

: For those short on time, the channel offers series recaps and "Full Episode in 10 Minutes" highlights. Series Overview & Highlights

: As the official home of Nickelodeon content, Paramount+ typically carries the complete 2012 series.