The top 5 TV shows returning in April, from Netflix's 'Russian Doll' to HBO's 'Barry'

Description: "In season two of 'Undone,' Alma realizes there may be deeper mysteries in her family's past. She crusades to uncover truths that could reshape her present-day reality."

Rotten Tomatoes critic score: 98%

What critics said: "It's a compelling journey of self-examination wrapped in a detective story." — NPR (season one)

Description: "'Better Call Saul' is the prequel to the award-winning series 'Breaking Bad,' set six years before Saul Goodman (Bob Odenkirk) became Walter White's lawyer. When we meet him, the man who will become Saul Goodman is known as Jimmy McGill, a small-time lawyer searching for his destiny, and, more immediately, hustling to make ends meet. Working alongside, and often against, Jimmy is 'fixer' Mike Erhmantraut (Jonathan Banks), a beloved character introduced in Breaking Bad. The series will track Jimmy's transformation into Saul Goodman, the man who puts 'criminal' in 'criminal lawyer.'"

Rotten Tomatoes critic score: 98%

What critics said: "With 50 episodes in its memory and 13 more to go, this is a meticulous closing stretch of the journey, astonishingly short on false moves so far." — Indiewire (season six)

Description: "'Barry' is a dark comedy starring Bill Hader as a depressed, low-rent hitman from the Midwest. Lonely and dissatisfied in his life, he reluctantly travels to Los Angeles to execute a hit on an aspiring actor. Barry follows his 'mark' into an acting class and ends up finding an accepting community in a group of eager hopefuls within the LA theater scene. He wants to start a new life as an actor, but his criminal past won't let him walk away —can he find a way to balance both worlds?"

Rotten Tomatoes critic score: 99%

What critics said: "Season two has a lot to live up to, and the early episodes successfully follow up on the borderline-perfect freshman season while introducing subtle new hurdles for its cast of tortured characters to twist through." — Consequence (season two)

Description: "Cassie Bowden (Kaley Cuoco) is living her best sober life in Los Angeles while moonlighting as a CIA asset in her spare time. But when an overseas assignment leads her to inadvertently witness a murder, she becomes entangled in another international intrigue."

Rotten Tomatoes critic score: 97%

What critics said: "Cassie moves through the world like a flesh-and-blood cartoon, careening from drunkenness to lucidity. Cuoco gives this physical recklessness some meaning, thereby humanizing a trope." — New Yorker (season one)

Description: "Nadia keeps dying and reliving her 36th birthday party. She's trapped in a surreal time loop — and staring down the barrel of her own mortality."

Rotten Tomatoes critic score: 97%

What critics said: "Tightly scripted, compassionate LOLs balance the Freudian nightmares, while every episode twists and evolves in unpredictable ways." — Guardian (season one)