Sister Act is an episode of the ALVINNN!!! and The Chipmunks series.
Following a fight with Brittany, Eleanor decides to move in with Alvin and his brothers! Alvin panics! Their "bro zone" has been invaded! Eleanor quickly rearranges the boy's entire lifestyle; including turning Alvin's bed...PINK. Alvin and his brothers decide it's time to strike back.
Following a "colossal" fight with Brittany, an upset Eleanor interrupts the boys' tennis match. When she asks to stay, Alvin denies the request as he doesn't want a girl in their "man cave." Unfortunately for Alvin, Dave overrules him and Eleanor takes over his bed and closet. Stunned and worried she will stay forever, Alvin convinces Simon to talk to her to no avail though he's not worried. Alvin confronts Dave to learn that Eleanor is making a deep impression on him with her cooking and cleaning. Eleanor continues to ruin Alvin's life and he's certain "girl power" is going to get the best of Dave. Simon's view of the matter is finally changed after Jeanette moves in. Unable to stand anymore, the boys confront Brittany who's enjoying her new independence. Desperate to fix the situation, they undertake "Operation Switchback;" they move into The Chipettes' Treehouse. The next day, Brittany drops by during Dave's make-over and embraces her sisters. On their way out, Alvin accidentally restarts their original argument.
- Series Running Gag: Alvin says the wrong word/phrase - Inn instead of in.
- Dave is the first character in the series to be tied up with the Chipettes' ribbons.
- The clip of Brittany walking down the hall, the clip of Eleanor dropping her stack of shoe boxes, the clip of Dave driving, the clip of Alvin screaming, the clip of Alvin annoyed by Eleanor talking, the clip of Theodore drumming, and the clip of Brittany startled by seeing The Chipmunks in the treehouse are included in the original series opening theme.
- Part of the Alvin Vs. Brittany and Driving Dave Crazy DVDs.
- This is the first episode in the series where Dave and The Chipettes have any interaction.
- Bagdasarian Production's Famous Chipmunks Make A Pitch Perfect Debut On Nick Jr. UK In New Series "Alvinnn!!! And The Chipmunks", Nickalive.com, Retrieved 2015-04-07.
- Top 100 Wednesday Cable Originals: 8.5.2015 Showbuzzdaily.com, Retrieved 2015-08-08.
- ALVINNN!!! and The Chipmunks Vol. 1, iTunes.apple.com, Retrieved 2015-10-28.
- Copyright Catalog, Cocatalog.loc.gov, Retrieved 2015-03-04.