<Tr> <Th> Posting </Th> <Td> USS Titan (NEM) Starfleet Academy (Seasons 4 - 7) USS Enterprise - D (Seasons 1--4) </Td> </Tr> <Tr> <Th> Position </Th> <Td> Engineering Officer (NEM) Starfleet Cadet (Seasons 4--7) Helmsman (USS Enterprise - D--Seasons 1--4) Civilian (USS Enterprise - D--Season 1) </Td> </Tr> <Tr> <Th> Rank </Th> <Td> Lieutenant, Junior Grade (NEM) Cadet (Seasons 4--7) Ensign (Seasons 3--4) Ensign (acting) (Seasons 1--3) </Td> </Tr> <P> Wesley Crusher is a fictional character in the television series Star Trek: The Next Generation, appearing regularly in the first four seasons and sporadically afterward . He is the son of Beverly Crusher and Jack Crusher and is portrayed by actor Wil Wheaton . </P>

What episode does wesley crusher become an ensign