One Day at a Time TV Show Cast: Full Cast List and Character Guide

Overview of One Day at a Time and Its Cast

One Day at a Time is a scripted comedy-drama that ran from 2017 to 2020 and centers on a Cuban American family in Los Angeles as they navigate mental health, work, relationships, and generational differences. The main cast is led by Justina Machado as Penelope Alvarez, a nurse and widowed mother; Rita Moreno as Lydia Riera, her sharply opinionated mother; Stephen Tobolowsky as Bennett Riera, the supportive father; and Marcel Ruiz as Alex Riera, the younger son. The show balances family comedy with candid conversations about trauma, identity, and caregiving, supported by a thoughtfully built ensemble.

Principal Cast and Characters

Main Cast Details

Justina Machado as Penelope Alvarez

Penelope is a former Army nurse and single mother of two who returns to work after her husband’s death. Machado brings warmth and wry humor to the role, balancing vulnerability with resilience. Her storylines center on employment challenges, dating, parenting, and processing grief, making her the emotional core of the series.

Rita Moreno as Lydia Riera

Lydia is the acerbic, fiercely loving matriarch whose quick wit and blunt honesty drive many of the show’s comedic moments. Moreno’s performance highlights generational trauma, cultural expectations, and the way affection can be expressed through teasing and rigor. Despite her sharpness, Lydia is devoted to her family’s well-being.

Stephen Tobolowsky as Bennett Riera

Bennett serves as the calm, steady father figure, balancing the household with patience and dry humor. Tobolowsky emphasizes reliability and empathy, often acting as a mediator during conflicts. His character also explores midlife adjustments, including career changes and companionship.

Marcel Ruiz as Alex Riera

Alex is the younger son who evolves from a sardonic teen into a more confident young adult. Ruiz captures the awkwardness of adolescence while addressing themes of grief, friendship, and self-acceptance. Later seasons focus on his activism, public speaking, and finding purpose after loss.

Recurring and Supporting Cast

• Ivonne Coll as Violeta Riera: Lydia’s mother, whose appearances provide glimpses of the family’s history and traditions.
• Isabella Ferreira as Elena Riera: The eldest daughter, whose college experience and activism broaden the show’s generational perspective.
• Todd Grinnell as Schneider: The earnest building superintendent who becomes a close friend and ally to the family.
• Melanie de la Cruz as Sheryl: Penelope’s pragmatic coworker, offering solidarity and workplace humor.
• Sierra Furtado as Cindy: A neighbor and friend who adds youthful energy and occasional conflict to the building’s social dynamics.

Character Evolution and Thematic Role

The cast of One Day at a Time is structured around growth and mutual support. Characters confront grief, mental health, cultural identity, and economic pressures with a mix of humor and sincerity. The show emphasizes found family, community care, and small daily acts of courage. As the family moves through seasons, the cast members’ arcs adapt to realistic change, such as moving out, career shifts, new relationships, and renewed activism, avoiding static tropes common in long-running comedies.

Notable Supporting Characters and Guest Appearances

Beyond the core ensemble, One Day at a Time has featured thoughtful guest appearances and recurring figures that deepen its themes. These include characters addressing veteran services, educators, and peers from school and work. While the main focus remains the Riera household, these interactions consistently reinforce the show’s grounded, empathetic tone.

Verifiable Cast and Role Summary