Which season marked Rebecca Donaldson's move from recurring to main cast?

Season three marked Rebecca Donaldson’s move from a recurring role to the main cast of Full House. Lori Loughlin first appeared as Rebecca in season two, when the character was introduced as Danny Tanner’s co-host on Wake Up, San Francisco.

Rebecca—usually called Becky—was originally hired for a limited six-episode storyline connected to Jesse Katsopolis. Producers expanded the character’s role after her introduction, and she became a regular beginning with the third season. Her promotion reflected the growing importance of Becky’s relationship with Jesse as well as her place in the Tanner household.

Becky and Jesse eventually became one of the show’s central couples. They nearly eloped in the season two finale, but ultimately married in season four. Later, they had twin sons, Nicky and Alex, in season five. A common mistake is choosing season two because that is when Rebecca first appeared; the question asks when she moved into the main cast, which occurred in season three.