Stitch falls in love with a female experiment that looks like him and names her "Angel", but Lilo is both jealous and suspicious of her. When she later looks up Angel on Jumba's computer, she discovers that the experiment turns good experiments back to evil by singing her siren song and is working for Gantu. Stitch runs after Angel and finds out the truth too late. Now, it's up to Lilo, Jumba and Pleakley to save Stitch before the other experiments turn on their own cousin.
- Moral: You've got to believe in love.
- For obvious reasons, Angel is the only experiment to not be regarded as one of Stitch's relatives.
- Angel is a parody of Lorelei the Siren, as her song is an evil in the guise of beauty, much like the Sirens of ancient myth.
- In the Finnish version of the series, her name is Seireeni, meaning "Siren."
- In the Arabic version of the series, her name is Farasha, meaning "Butterfly."
- Angel is a likely reference to the Elvis Presley song "(You're the) Devil in Disguise", as she is considered by Stitch to be beautiful while she is (or was) evil on the inside.
- Pleakley is revealed to be fascinated by romances between two individuals.
- Like Stitch, Reuben has a similar crush on Angel, yet she neither shares the same feelings nor even likes him.
- Hämsterviel's phone number is revealed on Angel's pet tag.
- Angel wore said tag only once throughout the entire episode: when she was running up Mount Waiʻaleʻale with Stitch following her. She never wore the tag any other time.
- When Stitch gets blasted into a net, his feet are exposed, even though he should have easily fit inside the net.
- The net would have likely captured both Angel and Stitch in it.
- Due to a continuity error, the fur pattern on Angel's back is inconsistent. In her episode, it is an upside-down heart. In "Snafu", it resembles Stitch's, but disappears in some scenes. In Leroy & Stitch, she does not have one at all.
- In spring 2004, Disney Channel held an online poll that asked viewers for their favorite experiments and episodes from Season 1 of the series. According to the top 10 results of that poll, "Angel" was the #1 most popular episode and experiment, likely foreshadowing the character's breakout status within the Lilo & Stitch franchise.