Seth MacFarlane to voice a character on 'The Simpsons,' a first

Seth MacFarlane commands the animated kingdom at Fox -- except for one very important part of that kingdom, "The Simpsons." Never voiced for the show. Never had any creative input -- even if there has been a lot of friendly (or not) banter between both sides.

Now, a truce: He will voice a character on this season's finale of "The Simpsons," Fox just announced, and it does sound kind of perfect. Full details:

"During the season finale, MacFarlane voices a charming married man whom Marge (Julie Kavner) inadvertently meets on a swingers’ website. In the first part of the season finale event, Homer (Dan Castellaneta), Moe (Hank Azaria), Lenny (Harry Shearer) and Carl (Azaria) win $200,000 in the Springfield Lottery. But when Carl takes off to Iceland -- his homeland -- with all the winnings, the guys embark on a Nordic adventure to get the cash back.

"Then, in the second part of the season finale episode, Marge mistakes a swinging Ashley Madison-type website for a Dolly Madison-type cupcake site, not realizing it’s a destination for married people seeking liaisons.

"On the site, she meets the charming 'Ben' (guest voice MacFarlane), who pursues her after they learn they share a love for a 'Downton Abbey'-type TV series, 'Upton Rectory.' Ben’s wife is guest-voiced by comic Lisa Lampanelli.

 The full hour episode airs May 19 at 8 p.m.