Mystery Theme #LP15 by PolinskyL

Coopers, a Wisconsin company, invented the Y-front brief and gave it what name, which would eventually become both the company's primary brand name and its corporate name?

Born Ashley Tyler Ciminella, the star of Kiss the Girls and Double Jeopardy has always used what last name professionally? (Her mother and half-sister do, as well.)

Aqua Regia is one of the few substances which can be used to dissolve what metal? This property was used by George de Hevesy to hide certain items of value at the Niels Bohr Institute from the Nazis.

Speaking of corrosive liquids, what arch-enemy of He-man lost (the skin of) his face when he was splashed with a vial of acid?

His surname - Mitchell - is rarely used, in favor of a nickname that references the havoc he seems to wreak wherever he goes. What is this fictional character's first name?

The Curly Tail Grub, Dardevle Spinnie, Rapala, Mepps Aglia, Zara Spook, and Berkley Power Worm are all brand names of what piece of fishing equipment?

Arguably the third-most prestigious club competition in England and Wales, the Capital One Cup was previously sponsored for ten years by what beer brand?

What 1985 novel by Larry Niven and Jerry Pournelle has Earth attacked by an elephantlike alien species?

Bertha is a TBM named after a former mayor of Seattle, and being used in the (behind-schedule) construction of Highway 99. What does the "B" in TBM stand for?

A 1999 Times headline called the perpetually under-construction Anglican cathedral on Manhattan's 110th St as "St. John the Unfinished". What adjective replaces 'unfinished' in the cathedral's actual name?

After a 3-year stretch on CNBC, what show, hosted by a Philadelphia native, has been airing on MSNBC for over a decade and a half?

If you've gotten the last 11 questions right, you won't be too far from figuring out the mystery theme.