Like many other generici active in Italian cinema, such as Irina Wassilchikoff and Andrea Esterhazy, Marcella Theodoli was a noblewoman, more precisely a marquise. Active since the 60s, she was never credited, but appeared in numerous films and TV productions, up until at least the late 90s - very frequenly in small party guest roles, but she was also memorable as Massimo Boldi's mother in I due carabinieri (1984).
Marcella Theodoli was identified thanks to the article Le divine comparse, published in the magazine Epoca n° 1282 (published on May 3, 1975).
- Il processo di Verona .... Vianini's wife (uncredited)
1967 - Le streghe .... Cook (uncredited)
- Requiescant .... Saloon girl (uncredited)
1973 - Io e lui .... Party guest (uncredited)
1974 - Il ritorno di Zanna Bianca .... Woman at the book launch (uncredited)
1975 - Divina creatura .... Party guest (uncredited)
- Mahogany .... Woman at fashion show (uncredited)
- Roma violenta .... Woman robbed at the restaurant (uncredited)
1976 - Bordella .... American Love Company customer (uncredited)
- Quel movimento che mi piace tanto .... Guest at the wedding party (uncredited)
- Roma, l'altra faccia della violenza .... Party guest (uncredited)
- Spogliamoci così senza pudor - segment "La visita" .... Friend of the Partibon family (uncredited)
1977 - Al di là del bene e del male .... Brothel madam (uncredited)
- Kleinhoff Hotel .... Hotel maid (uncredited)
1979 - I viaggiatori della sera .... Holiday village guest (uncredited)
1980 - Mi faccio la barca .... Dental patient (uncredited)
1981 - I carabbimatti .... Invited to the clinic party (uncredited)
- I ragazzi di celluloide (TV mini-series) .... Party guest (uncredited)
- L'uomo della sabbia (TV) .... Party guest (uncredited)
- Occhio alla penna .... Woman in train-restaurant (uncredited)
1982 - La sconosciuta (TV mini series) .... Woman at the hotel (uncredited)
- Storia d'amore e d'amicizia (TV mini-series) .... Rebecca, woman on the bus (uncredited)
- Tenebre .... Airplane passenger (uncredited)
- Vai avanti tu che mi vien da ridere .... Embassy party guest (uncredited)
1983 - Il conte Tacchia.... Circolo Araldico member (uncredited)
- La chiave .... Party guest (uncredited)
- Nana .... Client at the erotic club (uncredited)
- The Lonely Lady .... Patient in wheelchair (uncredited) / Audience member at awards show (uncredited)
1984 - C'era una volta in America .... A woman in the photo (uncredited)
- Cenerentola '80 .... Party guest (uncredited)
- I due carabinieri .... Occhipinti's mother (uncredited)
- I racconti del maresciallo (TV series) - ep. 3: "Il barboncino bianco" .... Woman at the awards show (uncredited)
- Nucleo zero (TV mini series) .... Dancing woman at nightclub (uncredited)
1985 - Caccia al ladro d'autore (TV series) - ep. 6: "Il calice di Murano" .... Baroness Razzi, a guest of the countess (uncredited)
- Le due vita di Mattia Pascal (TV).... Casino player (uncredited)
- Mamma Ebe .... Woman in the court room (uncredited)
1986 - Detective School Dropouts (Asilo di polizia) .... Airline passenger at customs (uncredited)
- Quando arriva il giudice (TV series) - ep. 4: "Morto per morto" .... Concierge (uncredited)
1988 - Una botta di vita .... German Tourist (uncredited)
1989 - Emma (TV) .... Party guest (uncredited)
- Il bambino e il poliziotto .... Condominium resident (uncredited)
- Il vigile urbano (TV series) - ep.: "Il ladro in scarpe gialle" .... Widow (uncredited)
1990 - Il male oscuro .... Tourist (uncredited)
- L'avaro .... Woman in church (uncredited)
1991 - Faccione .... Woman at art gallery (uncredited)
1992 - Edera (TV series) - ep. 21 .... Patient at the clinic (uncredited)
- Mutande pazze .... Woman at the vernissage (uncredited)
1993 - Pacco, doppio pacco e contropaccotto - segment "Tengo un americano" .... Roulette gambler (uncredited)
1997 - Linda e il brigadiere (TV series) - season 1, ep. 7: "La morale della formica" .... Retirement home resident (uncredited)
1998 - Linda e il brigadiere (TV series) - season 2, ep. 1: "Il fratello di Linda" .... Mrs. Sinclair (uncredited)
1999 - Tea with Mussolini .... Restaurant diner (uncredited)