Now: Fehr is also known for the role of Dan Cooper in ' CSI: Miami.' In recent years he's starred in ' Silent Night' and ' X-Men: First Class.' He recently appeared in two episodes of the CW series ' Nikita.' Then: Majandra Delfino played Maria De Luca, Michael's love interest throughout the show.

Maria is more artistically inclined and very quirky.

Then: Brendan Fehr was Michael Guerin, best friend of Isabel and fellow alien-human outcast.

Michael was in an on-again/off-again relationship with Maria through the entire series.

In season one she dated Alex Whitman, but the pair broke up, only to reunite just before Alex was killed.

Now: Heigl found great success on ' Grey's Anatomy' and in romantic comedies like ' Knocked Up,' '27 Dresses,' and ' The Big Wedding.' She's married to singer Josh Kelley and the pair have adopted two daughters together.

Malcolm Perry in the film ' Parkland.' Then: William Sadler played antagonist character Sheriff Jim Valenti.

Jim's dad was also a sheriff who was often ridiculed for believing that aliens lived among humans.

Emilie was born on 27th December 1981, and grew up in Mount Eliza, Victoria, Australia.In 1999, the WB (now known as the CW) premiered a little show called ' Roswell.' Based on the popular Young Adult books of the same name, the show followed a trio of teens who befriend another group of teens, but their new friends turn out to be aliens. The show ended in 2002 -- and now, 11 years later, we look back at the cast of the series and see where they are now.Then: Shiri Appleby played Liz, the good-natured main protagonist of the series who falls in love with Max Evans, a fellow high school student who is part alien.After 2 years on the show, she then made notable guest appearances in CSI: Miami (2002) and The Handler (2003).She stayed in TV, playing the bad girl Chris in Carrie (2002), a movie made for TV.