<P> Chloe finally reveals to Clark in the season five premiere that she has known his secret , but that she wanted him to be comfortable enough to tell her on his own . At the same time , Clark reveals that he was not infected by the meteor rocks in Smallville , as Chloe initially suspected , but that he is in fact an alien who was sent to Earth as a baby during the meteor shower of 1989 . In season five 's `` Thirst '' , Chloe earns her dream job at the Daily Planet , starting in the basement . In the season six episode `` Justice '' , Chloe begins assisting Green Arrow ( Justin Hartley ) and his team of superheroes under the codename `` Watchtower '' . In `` Freak '' , she discovers she herself is meteor - infected , with an unknown ability , and begins to worry that she is a `` time bomb '' heading towards insanity . She later discovers in `` Progeny '' that her institutionalized mother , Moira Sullivan ( Lynda Carter ) , is meteor - infected as well . In the season finale , Chloe learns that her special power lets her heal any wound and even reverse death , when it activates to save Lois . In season seven 's `` Descent '' , when Chloe attempts to keep information regarding `` The Traveler '' a secret from Lex , who is unaware that `` The Traveler '' is really Clark , he fires her from her job at the Daily Planet . When in `` Sleeper '' , Lana falls into a catatonic state having been attacked by the Kryptonian artificial intelligence known as Brainiac ( James Marsters ) , Chloe takes over Lana 's Isis Foundation , a free clinic for individuals who have been infected by the meteor rocks . In the seventh season finale , Chloe is attacked by Brainiac , but her healing powers prevent him from harming her . When she returns home , Jimmy Olsen ( Aaron Ashmore ) , her on - again - off - again boyfriend since season six , proposes marriage . Before Chloe can answer the Department of Domestic Security ( DDS ) appears and arrests her for hacking into the government database . </P>
<P> Chloe finally reveals to Clark in the season five premiere that she has known his secret , but that she wanted him to be comfortable enough to tell her on his own . At the same time , Clark reveals that he was not infected by the meteor rocks in Smallville , as Chloe initially suspected , but that he is in fact an alien who was sent to Earth as a baby during the meteor shower of 1989 . In season five 's `` Thirst '' , Chloe earns her dream job at the Daily Planet , starting in the basement . In the season six episode `` Justice '' , Chloe begins assisting Green Arrow ( Justin Hartley ) and his team of superheroes under the codename `` Watchtower '' . In `` Freak '' , she discovers she herself is meteor - infected , with an unknown ability , and begins to worry that she is a `` time bomb '' heading towards insanity . She later discovers in `` Progeny '' that her institutionalized mother , Moira Sullivan ( Lynda Carter ) , is meteor - infected as well . In the season finale , Chloe learns that her special power lets her heal any wound and even reverse death , when it activates to save Lois . In season seven 's `` Descent '' , when Chloe attempts to keep information regarding `` The Traveler '' a secret from Lex , who is unaware that `` The Traveler '' is really Clark , he fires her from her job at the Daily Planet . When in `` Sleeper '' , Lana falls into a catatonic state having been attacked by the Kryptonian artificial intelligence known as Brainiac ( James Marsters ) , Chloe takes over Lana 's Isis Foundation , a free clinic for individuals who have been infected by the meteor rocks . In the seventh season finale , Chloe is attacked by Brainiac , but her healing powers prevent him from harming her . When she returns home , Jimmy Olsen ( Aaron Ashmore ) , her on - again - off - again boyfriend since season six , proposes marriage . Before Chloe can answer the Department of Domestic Security ( DDS ) appears and arrests her for hacking into the government database . </P>
when does clark reveal his secret to chloe
when does clark reveal his secret to chloe
season five premiere
season five premiere