Kristen Wiig revived her classic “Saturday Night Live” character Dooneese on the show’s 50th anniversary special on Sunday night.

Wiig appeared during the first sketch of the evening, “The Lawrence Welk Show,” alongside Fred Armisen as Lawrence Welk; Will Ferrell as singer and actor Robert Goulet; and Scarlett Johansson, Kim Kardashian and Ana Gasteyer as her fellow Maharelle sisters — Janice, Holly and Margaret, respectively.

Ferrell, who rode a Vespa with a sidecar onto the stage, began performing a song and scatting, causing the audience to roar with laughter.

“Oh my god. Did they put LSD in my Caesar salad, or do I see three beautiful ladies hitchhiking my way?” Ferrell asked, as he made his way over to Johansson, Kardashian and Gasteyer, who sang the Maharelle sister’s introduction song. The show then cut to Wiig as Dooneese, sitting in the Vespa’s sidecar and honking the horn with...