ER Reunion, Stars in the House, Thursday 4, 22 at 8 PM EST. Series streaming exclusively on Hulu

The reunion episode will feature cast members Gloria Reuben (Jeanie Boulet), George Clooney (Doug Ross), Noah Wyle (John Carter), Laura Innes (Kerry Weaver), Anthony Edwards (Mark Greene), Alex Kingston (Elizabeth Corday), Julianna Margulies (Carol Hathaway), Goran Visnjic (Luka Kovac), Paul McCrane (Robert Romano), MingNa Wen (JingMei Chen), Laura Cerón (Chuny Marquez), Yvette Freeman (Haleh Adams), Conni Marie Brazelton (Connie Oligario) and CCH Pounder (Angela Hicks). This special episode of Stars in the House will be held in benefit of the Waterkeeper Alliance the fastest growing global nonprofit focused solely on clean water. For more info: Stream all 15 seasons of ER exclusively on Hulu Subscribe to People , StarsInTheHouse, ERReunion, PEOPLE, ER, GeorgeClooney, GloriaReuben, NoahWyle, LauraInnes, AnthonyEdwards, AlexKingston, JuliannaMargulies, GoranVisnjic, PaulMcCrane, MingNaWen, Laura