London, May 10 (Inditop) Hollywood superstar George Clooney’s return to the US hospital drama “ER” gave its channel More4 the highest ratings to date.

Clooney, 48, appeared again as his character Dr. Doug Ross with other early faces Julianna Margulies and Eriq La Salle, as the hit neared the end of its 15th and final series, reports thesun.co.uk.

An average 791,000 viewers tuned in Thursday and 84,000 caught up an hour later to watch the show.