Behind the scenes changes resulted in the season being poorly received by many fans and cast members. The season opener was based around the unlikely premise of Spock's brain being removed and then reattached without any adverse effects, which received much derision. (In his 2008 autobiography Up Till Now, William Shatner sarcastically calls the episode's plot a "tribute" to the top brass at NBC.) The cast also seemed to be unhappy with "The Way to Eden" , in which the Enterprise was visited by a group of "space hippies".