618 - Little Green Men and a Fella's Marriage Proposal

Sheldon wants to search for life on other planets and Mandy answers Georgie's marriage proposal. Also, Missy is caught between two friends.

• Guest Stars:
• Emily Osment as Mandy
• Ed Begley, Jr. as Dr. Linkletter
• Wallace Shawn as Dr. John Sturgis
• Wendie Malick as President Hagemeyer
• Melissa Peterman as Brenda Sparks
• Wyatt McClure as Billy Sparks
• Wil Bowers as Dr. Thompson
• Jim Hanna as Dr. Hayes
• Penny L. Moore as Dr. Evans
• Dhruv Uday Singh as Dr. Prakash
• Stewart Skelton as Dr. Adams

• Writers (Story):
• Steven Molaro
• Jeremy Howe
• Marie Cheng

• Writers (Teleplay):
• Steve Holland
• Eric Kaplan
• Nadiya Chettiar

• Director:
• Matthew A. Cherry