After hearing about Earth from Queen Beryl (who was later destroyed), Alan and Ann headed over there to take it over and drain energy from people for the Doom Tree, who needs energy to survive, and if it dies, they die. While posing as a human at Serena's school, Ann fell in love with Darien, and later discovered that Alan was in love with Serena, which made her jealous. Alan and Ann would send Cardians to try and extract energy, Ann usually picking out the Cardians.
Eventually, the Sailor Scouts discovered Alan and Ann's true identities, and they fought them in the Doom Tree's room, but soon realized that what they were doing was wrong, and could tell the true power of love from Darien and Serena. Eventually the Doom Tree attacked Alan and tried to stab him with its branches, but Ann jumped in front of him to protect him and took the hit and died because of her injuries. After being healed by Sailor Moon, it revived Ann, and Alan and Ann left Earth with the Doom Tree to start a better life somewhere.
Ann attacks by using an attack similar to a Force Push from Star Wars.
- Alan and Ann's names are a play on the word "alien".
- Alan's claim that he and Ann knew Queen Beryl was exclusive to the DiC Entertainment dub. In the Japanese version and Viz Media dub, neither of them made any mention of the latter, nor was there any indication that they ever knew or encountered one another.