Because a superhero movie can certainly never be plagued by too many villains, Karen Gillan has been hired on to side beside Lee Pace as a lead antagonist in Marvel's Guardians of the Galaxy. THR reports she's signed on to the alarmingly-vast cast of James Gunn's superhero space adventure, which starts shooting later this month with Chris Pratt, Zoe Saldana, Michael Rooker, Glenn Close, John C. Reilly, Batista, a tree man, and a talking raccoon all playing parts. Like with Pace, though it's known the former Doctor Who star will be playing a main enemy, it's not being revealed who that actually is. Probably whichever intergalactic villain has the power of being adorably winsome.
UPDATE: You can also add Benicio del Toro to the list. Variety says he, too, has joined Guardians of Galaxy in an unspecified role.