Alan is planning a vacation and he is excited to go away. Big Bird is very upset and can't believe Alan won't be at Hooper's Store. Nothing will ever be the same again! Alan has advertised that he will be looking for someone to fill in for him when he is gone. Natalie stops by for a glass of juice and ends up making an omelet and singing about it. Alan hires Natalie on the spot, and goes off to pack for his trip. Baby Bear and Big Bird have a very hard time adjusting to Natalie replacing Alan, and are anxious about the change. However, they get to know Natalie and she teaches them how some changes can be good changes. They realize that a change doesn't have to be bad. Natalie makes a birdseed milkshake just as Big Bird likes it, with birdseed!
The episode's theme is coping with emotions, and global awareness. The show will be brought to you by the letter D and the number 7. Along with Big Bird, Baby Bear, Natalie, and Alan, there is an "AM Elephant" (likely Elephante, or whatever his name is currently, and (rub-a-dub-dub) three men in a tub, a butcher, a baker, and a candlestick maker.
The show will air April 8, May 14, June 21, July 27, September 1, and October 7
Note that this is the exact text used on the PBS site-- it spells advertised the British/Canadian/Australian way, not the American way, advertized.