sentences:  Astronaut Mike Dexter (John Anderson) is Liz's fantasy boyfriend, to whom she compares all other men; Mike often appears when Liz is either alone or involved in disastrous relationships, and is no longer seen once she develops a (relatively) normal social life.Liz mentions Dexter in several episodes, and he appears in her imagination throughout Season 4.In a fantasy sequence in "Dealbreakers Talk Show#0001", Dexter tells Liz he has to go back to space, but "enjoyed the kissing followed by [his] genuine interest in that TV dance competition".