Not really. The Entropy arc consists of only the 18th season. The entropy caused by the Logopolitans' inability to contain the destruction of the universe created the E-Space entry for the Doctor and Romana to get in. And thats all after the Doctor started using the Randomizer again. The story concludes in Logopolis
Its a subtle arc, I admit, but the intent is there.
The Master's Return arc is only three stories long, and consists of the last two stories of the 18th season, with a forced tag-along of Castrovalva
in the next season - Bidmead didn't think the story would be followed-up upon so directly before they called him to write the Fifth Doctor's opening story.
Finally, I made the thread about the season-long arcs, ones that run more than a couple of stories in a given season. Thus why I also ignored other arcs, like the Black Guardian trilogy in series 20 of OldWho.