 In the episode "Only a Dream", he volunteered to be a guinea pig for a doctor's experiments with the Materioptikon, a machine that gave people ESP abilities.
<coherence>  In the episode "Only a Dream", he volunteered to be a guinea pig for a doctor's experiments with the Materioptikon, a machine that gave people ESP abilities.
 He volunteers to be a guinea pig for a doctor's experiments with the Materioptikon, a machine that gave people ESP abilities.