Dallas: Ted Shackelford’s first scene as Gary Ewing 

From Season 3 Episode 14: Return Engagement
Valene returns to her apartment where she sees that Gary is packing his suitcase and he tells her that he’s been offered a job in California. Gary tells Valene that he can’t stay in Texas and they should take things easy even though he hasn’t seen Lucy. Gary and Valene aren’t sure if they can make it together. Gary fears that Miss Ellie will drag him back to Southfork when Valene told him about the talk they had. Gary begs Valene not to pressure him and he leaves her again.
Note: Beginning with this scene, Ted Shackelford replaces David Ackroyd as Gary Ewing.