Beti

Beti is one of the three aliens on the UFO in Jolly Roger's Lagoon. Banjo and Kazooie must activate all four generators with Ice Eggs in 20 seconds to power up the alien's ship, allowing them to leave Jolly Roger's Lagoon. They will reward the bear and bird with a Jiggy and then head to the icy side of Hailfire Peaks to find their missing children.

Beti and the other aliens were last seen in the Terrarium of Terror in Banjo-Kazooie: Nuts & Bolts.

It is interesting to note that while Alph only mentions three aliens by name and there are three in the character parade, there are actually four aliens in the UFO. The reason for this mistake is unknown.