Talk Shows Celebrate Halloween: Alexander Hamilton,

Pikachu, Sia, Joker and Harley Quinn Among Most Popular Look

Who says Mondays are dull? The morning and daytime talk shows kicked off the week with a bang as Good Morning America, Today, Live With Kelly (and guest co-host Jerry O'Connell), The View and The Ellen DeGeneres Show all celebrated Halloween with costumed extravaganzas.

Sia was a popular costume, with both DeGeneres and Good Morning America's Amy Robach dressing up as the singer whose distinctive wig covers the top of her face. Lin-Manuel Miranda's Broadway sensation Hamilton was still a hit on GMA and Live, with both Lara Spencer (as Larazander Hamilton) and Kelly Ripa dressing up as the founding father and performing modified versions of "Alexander Hamilton" and "My Shot."This year's Live Halloween special marked the first one in years that former co-host Michael Strahan wasn't a part of, so O'Connell filled in, with the show even poking fun at Ripa's search for Strahan's replacement. Ironically, though, both O'Connell and Strahan, now on GMA, wore the same costume on Monday: Pikachu. O'Connell, however, in keeping with Live's multi-costume approach, sported several ensembles over the course of the hour-long talk show.That wasn't the only time Live and GMA repeated themselves. Both shows featured performers dressed as Suicide Squad's Joker and Harley Quinn and Ken Jeong made cameo appearances on GMA, Live and The View on Monday.Good Morning AmericaSpencer was the first to unveil her costume, with co-hosts Robin Roberts and George Stephanopoulos saying they hadn't seen her all morning before she burst through a $10 bill background and introduced herself as Larazander Hamilton, dressed as Miranda's Broadway character, complete with a goatee and dark hair. She sang a revised version of "My Shot" for Pop News, which she attempted to deliver all in rhyme.Spencer then starred in a horror movie — a TV show-inspired bit in which she wandered around the deserted GMA studios and encountered spooky sights that alluded to The Shining, Poltergeist and Stranger Things, even running into an Eggo-loving Robin Roberts in the Upside Down. The video included references to The Blair Witch Project and Scream, too, with Ken Jeong on the line asking Spencer what her favorite scary movie is.Later, the GMA hosts took a bunch of kids on a celebrity Pokemon hunt, with Sara Haines and Alfonso Ribeiro helping out as Ghostbusters. During their search, they found Ginger Zee dressed as a forgetful Dory, Gio Benitez as Jigglypuff, Amy Robach as Sia and Strahan as Pikachu. Dancing With the Stars performers Maksim Chmerkovskiy and Peta Murgatroyd also got into the act, making an appearance as The Joker and Harley Quinn.When the co-hosts went back outside, playing $100,000 Fear-a-mid, inspired by the Strahan-hosted $100,000 Pyramid, Jesse Palmer showed up as Captain America and TJ Holmes stopped by as Madea, even getting advice from Tyler Perry himself, who called in and offered Holmes tips on doing Madea's voice.TodayNBC's Today show went back to the '90s, counting down some of the biggest pop-culture moments from the decade. And who better to host that countdown than former TRL host himself, Carson Daly, channeling his '90s MTV persona. As he counted down the pop-culture highlights, the Today co-hosts revealed their costumes.Tamron Hall and Willie Geist took on Uma Thurman and John Travolta's dancing characters from Pulp Fiction. Savannah Guthrie recreated Demi Moore's famous pregnant Vanity Fair cover, in a morning-show friendly fashion: the pregnant Today co-host stuck her head through a large magazine cover depicting Moore's nearly-nude pose. Daly also played Arnold Schwarzenegger's Terminator character, while Al Roker dressed as Steve Urkel. Matt Lauer recreated Today'sSeinfeld cameo, dressing up as the puffy shirt-sporting Jerry, with former Today host Bryant Gumbel, who appeared in that Seinfeld episode, reprising his cameo role.