EXCLUSIVE: Childrens Hospital co-star Ken Marino has joined the cast of the upcoming fourth and final season of HBO‘s comedy series Eastbound & Down, starring Danny McBride as self-obsessed and self-destructive baseball player Kenny Powers. Marino is slated to appear in all eight episodes from Season 4, playing Guy Young, a middle-aged athlete who’s still living the high life and partying it up every weekend. Also cast as a recurring next season is Tim Heidecker as Gene, a vanilla guy in Kenny’s neighborhood. He has nothing in common with Kenny and lacks even a basic sense of humor.

At the end of Season 3, Kenny Powers finally made it back to the majors and recaptured his former glory, only to fake his own death and run back home to April, the mother of his child. The upcoming fourth season picks up the action several years later and finds Kenny living the American Dream with his family in North Carolina. Marino, repped by Principato Young and IFA, is coming off two indies: Milo, which premiered at SXSW, and In a World …, which premiered at Sundance. He also did two pilots last season — NBC’s The Gates and Brenda Forever — and has the successful digital series Burning Love, which re-airs on E! He currently is writing True Freshman for 21 Laps/Radar and Fox, as well as Go The F To Sleep for Fox 2000 with his writing partner and wife, Erica Oyama.