The Best Guest Stars On That '70s Show

Luke Wilson, known for his roles in such films as "Old School," and "Legally Blonde," is also a member of the "That '70s Show" family. As viewers will recall, he played Casey Kelso, older brother of Ashton Kutcher's Kelso, in six episodes of the sitcom. Casey was first introduced in the 2002 episode "Donna Dates a Kelso," in which the character returns to Point Place after a stint in the army. As the title suggests, Donna reluctantly goes on a date with Casey. In a subsequent episode, jealous Eric confronts Casey, who reveals his true intentions toward Donna are to use her and dump her. Reflecting upon the sitcom's cameos, The Washington Post called Wilson's performance "great."

In Casey's final appearance, a few years later, he's now working as a gym teacher. When Eric is denied his diploma because he failed physical education, he's forced to take summer school phys-ed classes — which just happen to be taught by Casey, still bitter about being dumped by Donna, who's now Eric's girlfriend. Casey winds up offering Eric a deal: he'll pass him, allowing him to get his high school diploma, if he can successfully perform one single pull-up.

Kelso's big bro didn't show up in the last season of the series. As Screen Rant noted, "his fate was left unknown," but Casey's "disappearance was also likely connected to Wilson's busy schedule" at the time. 

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