John Cusack, Rob Corddry dip into 'Hot Tub'

Time-traveling comedy is being directed by Steve Pink

"Hot Tub Time Machine" is warming up.

John Cusack and Rob Corddry have boarded the MGM comedy, while Craig Robinson and Clark Duke are in negotiations to also star in the pic, being directed by Steve Pink.

The script, by Josh Heald, follows a group of guys who have grown frustrated with their adult lives. They return to the ski lodge where they partied as teens to find answers and are transported to 1987 via their hot tub, a bubbly time machine.

Cusack, Corddry and Robinson are the three best friends, while Duke is Cusack's younger brother.

Pink is polishing the script in order to play to each comedian's strengths.

Cusack is producing with partner Grace Loh via their New Crime banner. Matt Moore also is producing.

An April 20 start date in Vancouver is being eyed.

Cusack, repped by WMA, has "Shanghai" and "2012" in the can, while Corddry, repped by Endeavor and Principato/Young, last appeared in "W." and "Harold & Kumar Escape From Guantanamo Bay."

Robinson, repped by UTA and 3 Arts Entertainment, is best known for his work on NBC's "The Office" and stole scenes in "Zack and Miri Make a Porno."

Duke, repped by Endeavor and Generate, starred in Summit's "Sex Drive."