Watch Forgetting Sarah Marshall (2008) HD Full Movie Free on SolarMovie. Watch Forgetting Sarah Marshall (2008) online free. Devastated Peter takes a Hawaiian vacation in order to deal with the recent break-up with his TV sta...Devastated Peter takes a Hawaiian vacation in order to deal with the recent break-up with his TV star girlfriend, Sarah. Little does he know, Sarah's traveling to the same resort as her ex - and she's bringing along her new boyfriend.