• AOL TV, Tuesday, July 19, 2011 3:30 PM

The ongoing puzzle at the heart of the six seasons of "How I Met Your Mother" that have already aired -- just who the hell IS the mother? -- should be revealed in season eight. That will most likely be the sit-com's very last season, says creator and executive producer Craig Thomas in a TV Guide interview dissected on AOL TV.

However, there's still a possibility "HIMYM" could continue past its expiration date, writes Catherine Lawson: "A lot at CBS is riding on what happens with the new Charlie Sheen-less 'Two and a Half Men.' Should the Ashton Kutcher version prove unpopular with audiences CBS may want to keep the ever-dependable 'HIMYM' on the air for an extra season or two while it develops a replacement."

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