Comic, singular, may designate either a 'strip', an integrated series of panels, published on a single occasion:
today's comic = the strip published today
the previous comic = the last strip published before the current one
or a work, a sequence of strips published under a single title:
David Willis' newest comic 'Dumbing of Age'
Comics is the plural of comic in either sense, so it may designate either a set of strips
today's comics = the strips published today, typically the page of strips in a newspaper
last week's 'Dumbing of Age' comics = the strips published last week under the title 'Dumbing of Age'
or a set of works
I regularly follow about a dozen comics.