Tags: Television Season.
The fourth season of the American television series 90210 was announced by The CW on April 26 2011. It was later announced it would return to its original Tuesday 8:00 pm time slot as a lead-in to new series Ringer and premiered on September 13 2011.Trevor Donovan was dropped as a regular as a result of ongoing changes by the new showrunners. He returned as a guest star in the fall to conclude his storyline.