She and Ashley have a Mom and an "Aunt Rachel" who appear in the episode "Aunt Rachel Is Here!" in which it is revealed that Alissa and Ashley's Aunt Rachel is getting married and that Alissa and Ashley will be in her wedding. In the episode "It's Tradition", Alissa and Ashley reveal that their family celebrates their own holiday Sister Celebration since there's so many sisters in their family. It is unknown if Alissa is allergic to milk like her sister Ashley.
- Twice Is Nice! (first appearance)
- Barney's Talent Show
- It's Tradition
- Oh, Brother...She's My Sister
- Barney's Halloween Party (cameo)
- Aunt Rachel Is Here!
- Barney's Night Before Christmas (cameo; final appearance)
- Ashley appears within all of her appearances.
- She never appeared without Ashley.
- Neither Alissa nor her twin sister Ashley appear with Kathy, Carlos, Juan, or Kenneth in Season 3. They also do not appear with Emily in Season 5, or Stephen with glasses.
- Alissa never appeared with Maria, unlike Ashley.
- Alissa never appeared with Keesha at the same time, although both did appear in Barney's Halloween Party and Barney's Night Before Christmas. She also never appeared with Curtis, although both did appear in Barney's Halloween Party.
- Alissa only appeared with Chip, Danny and Kim in Barney's Night Before Christmas.