Sebastian Stan also joins Cusack sci-fi comedy

Lizzy Caplan is waiting for John Cusack... in 1987.

Caplan is one of three actors who signed on for Cusack's "Hot Tub Time Machine," according to The Hollywood Reporter. She'll be joined by Crispin Glover (as a wacky -- and knowing Glover, definitely creepy -- bellhop) and Sebastian Stan (as a cocky ski instructor).

The plot follows four buddies who, missing their wild high-school days, stumble upon the titular device and revisit 1987. Rob Corddry signed on in February.

Glover, 45, stars in this year's sci-fi flick "9." Caplan, 26, co-starred in 2008's "Cloverfield." Stan, 25, co-starred on the NBC series "Kings."