My favorite Arthur appearance was her eye popping 2 episode appearance as "Zelka" in the last season of Mork and Mindy. if you'll remember Robin William's improv mentor and partner Jonathan Winters joined the cast of M&M as their fully grown newborn son Mearth (see on Ork you're hatched from your father full grown and regress through time). Convoluted story I admit but it afforded a glimpse into Mearth's kindergarten populated by middle aged toddlers, including Ms. Arthur as Zelka, a pigtailed beyond buxom blonde.
Argyle's right, her bust in the early 80's was well into the 40's, eclipsing Kitten Natividad as I researched in the VHS tapes that became the Rackumentary. She had a small part in the first of 2 episodes, and a bigger role in the following show where Mearth invted her over for an innocent sleepover which naturally worried M&M her costume was same the Orkin red jumper that was Mork's trade mark, though hers was unzipped a few inches and bursting at the seams. A truly heaving, bouncy performance. Too bad M&M was pulled from Nick at Nite before had a chance to tape it., the DVD for this season seems far off and the local UHF station that carries M&M shows them in seemingly random order, I guess we'll have to be patient.
M&M producers must've had a thing for outsized women as they also cast (a pre-hormonal shift yet still huge) Joyce Gibson as a clumsy cheerleader wannabe who's boobs get her way and Amazon fetish model Kathleen "Tallkat" McIntyre as Mork's 6 foot 9 librarian. See IMDB for episode information.