MASH's popularity led to a very strange parody, MUSH, which ultimately failed. Regarded as one of the best sitcoms of all time, it shouldn't be surprising that MASH was also immensely popular during its time on the air. MASH's finale remains both the most-watched finale of any show and the most-watched episode of a scripted series. Considering the many viewing avenues now, it's unlikely that its record will be broken. Before it even reached that, however, MASH was already making waves during the middle of its run.
https://screenrant.com/mash-cartoon-mush-filmation-abc-fail/