I’m not sure there’s anything on TV like “Community,” and that’s probably worked against the viewership of the show.

The NBC sitcom is about as atypical a situation comedy as anything airing now. The premise – a diverse group of misfits forms a family while attending a community college – isn’t novel.

But during its first three seasons, under the guidance of creator Dan Harmon, “Community” became something more.

There were inklings of the show’s inherent “different-ness” in the first season, certainly. But the first-season finale, in which the regulars and the large supporting cast wage war in an on-campus paintball match to win “priority status” for class registration, established the show as surely as “Prophecy Girl,” the first-season finale of “Buffy the Vampire Slayer,” established that series as one for the ages.

The paintball episode played, with furious and hilarious seriousness, like an action movie, “Terminator” by way of John Woo, with standoffs and ambushes and devilish double-crosses. All played against expectations.

My favorite moment is when off-kilter geek Abed (Danny Pudi) rushes up to snarky lawyer Jeff (Joel McHale) and intones, “Come with me if you don’t want paint on your clothes.” Fans of the “Terminator” movies recognized that line.

Throughout the second and third seasons, “Community” deepened its characters – a group that is frequently at each others’ throats but can’t live without each other – and raised the freak flag higher. An episode revolving around a game of Dungeons and Dragons was funny and touching.

By the time “Remedial Chaos Theory” aired early in the third season, Harmon and the cast and crew knew they could get away with a lot. And they did. As the characters gathered at a housewarming party for roommates Abed and Troy (Donald Glover), they rolled dice to see who would go downstairs to meet the pizza delivery guy.

With each roll of the dice, another reality unfolded. Friendships ended, relationships began and lives were lost, for god’s sake. It was all funny and incredibly clever and mind-bending in a way precisely unlike any show on TV right now.

The show has mixed in a tremendous amount of geekery in a manner that’s less showy but more genuine than the amusing “Big Bang Theory.” After “Remedial Chaos Theory,” the series explored the other, “darkest timeline” and, with a nod to the “Star Trek” mirror universe, Troy and Abed donned Evil Spock-like goatees.

When “Community” returns on Oct. 19, it will be without Harmon, a creative man bounced from his own show, if we’re to believe his own account and those of others, over huge differences in temperament and people skills.

So I’m not sure what “Community” will be like when it returns. Will it be just a silly sitcom? Will it continue to defy expectations and conventions? We’ll know soon.