As of the last major sweep of copyright claims, here is the typical status of El Regreso on Dailymotion:

While Dailymotion might offer snippets or user-uploaded versions, the quality can be inconsistent—ranging from low-resolution recordings to Spanish-language only streams without subtitles. For the best viewing experience, the series is officially available on Atresplayer Premium in Spain. Depending on your region, it may also be licensed to local streaming platforms.

While the temptation to type "los protegidos el regreso dailymotion" into your browser is understandable, there are several drawbacks to be aware of:

This is the primary source. The first two episodes of El Regreso were free, but the full season (8 episodes) requires a premium subscription.