Hollywood's go-to guest star pops up again, this time on the Sept. 23 season premiere of NBC's Community. So who does Betty White play? ''Well, she is my lover,'' deadpans series star Joel McHale. ''And she is really experimental — it was disturbing.'' Okay, he's kidding. In all seriousness, the 88-year-old portrays demented professor June Bauer, who teaches an anthropology class at the community college where ex-lawyer Jeff (McHale) is enrolled.