THEN AND NOW: How the cast of 'That '70s Show' has changed from the original series to the Netflix s

• Season one of "That '90s Show," the sitcom sequel series to "That '70s Show," is now streaming. 
• Several stars from the original show make appearances on the new Netflix spin-off.
• Some cast members, like Topher Grace (Eric Forman), look the same while others have different styles.

Kurtwood Smith is known for his role as Red Forman on "That '70s Show."

He's a stern and tough parent who fought in World War II and the Korean War.

Smith reprises his role on Netflix's spin-off series, "That '90s Show."

Red is just as cranky as ever on the spin-off, this time toward a new generation of kids. 

When fans last saw Debra Jo Rupp's Kitty Forman on "That '70s Show," she ditched her classic '70s hairstyle for a more modern one.

Kitty and Red originally intended on selling their home in Point Place so they could move to Florida.

Red and Bob Pinciotti were also planning on opening a bait stop together there.

But on the finale, Kitty had a change of heart and realized she didn't want to leave, so the couple stayed in Wisconsin. 

On "That '90s Show," Kitty has a more feathered hairstyle that's reminiscent of her past look.

A wig helps transform Rupp into the beloved matriarch. Kitty's iconic laugh is also back on the spin-off. 

Topher Grace rose to fame as Eric Forman, the protagonist of "That '70s Show."

Grace exited the show after season seven but returned for the series finale, which aired on Fox in May 2006.

The actor's absence on the eighth and final season of "That '70s Show" was explained by Eric leaving Wisconsin to teach in Africa for a year.

He briefly returned for the series finale, arriving back in town shortly before midnight and the start of the '80s.

Even though years have passed since Grace played Eric, he looks the same on "That '90s Show."

Now, he's 38 years old, lives in Chicago, and works as an adjunct professor at a university, teaching a course called "The Religion of 'Star Wars.'"

Laura Prepon's Donna Pinciotti debuted blonde hair at the start of season seven.

Donna's hair-color change on the last two seasons of the show was due to her role in the 2006 film "Karla," which required her to ditch her red shade and go blonde. 

Donna's red hair is back on "That '90s Show," but this time she has bangs.

Eric and Donna are married and have a daughter named Leia (Callie Haverda). Donna is also a published author.

Season one of "That '90s Show" kicks off with the family visiting Red and Kitty in Point Place for the Fourth of July.

Leia ends up meeting cool kids her age and begs Eric to let her stay for the duration of the summer. 

Prepon appears on three episodes and serves as the director of episodes nine and 10.

Ashton Kutcher starred as the moronic Michael Kelso on "That '70s Show."

Kutcher wasn't as present as much on the final season due to his interest in exploring film projects, but Kelso did return to ring in the new year with his friends.

By the end of the show, Kelso was living in Chicago with his daughter Betsy (from his relationship with Brooke Rockwell) and working security at the Playboy Club. 

Kelso returns on Netflix's spin-off show for a cameo on the premiere.

Kelso's hair is a bit longer than it was on the finale of "That '70s Show," and he's living in Wisconsin with Jackie Burkhart (Mila Kunis) and their son, Jay Kelso (Mace Coronel).

Mila Kunis' breakout role came when she landed the role of the rich and talkative character Jackie Burkhart on "That '70s Show."

Despite her on-again, off-again relationship with Kelso throughout the show, the two characters didn't end up together by the end of "That '70s Show." 

Kunis reprises her role as Jackie on "That '90s Show," this time with long, wavy hair and bangs.

When fans see Jackie and Kelso on the spin-off, they're preparing to get remarried for the second time. 

Wilmer Valderrama portrayed Fez, a foreign exchange student, on "That '70s Show."

On the penultimate season, he worked as a shampoo boy at a salon in town. 

On the spin-off, Fez sports a new hairstyle and is a successful hairdresser.

He has a hair-salon chain called Chez Fez and his home country is still unknown to viewers.

Fez reveals to Kitty on episode three that he and Jackie are no longer together because she left him for Kelso. 

Don Stark played Bob Pinciotti, Donna's dimwitted but well-intentioned father.

On the final season of "That '70s Show," Bob sold his home, retired, and decided to move to Florida.

Bob still looks very similar on "That '90s Show."

He has the same hairstyle from the '70s and lives in Florida. 

Tommy Chong played the stoner character Leo.

He worked at the Photo Hut and recurred on the show. 

Leo, now 74 years old, is still as clueless as ever on "That '90s Show."

Chong reprises the role for episodes two and nine of "That '90s Show."

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