Arthur Square (voice) (played by Martin Sheen) is a protagonist in Flatland.
Protagonist, a square in Flatland who discovers higher dimensions. Hex (voice) (played by Kristen Bell) appears in Flatland.
Curious young granddaughter of Arthur Square, embarks on dimensional journeys. King of Pointland (voice) (played by Tony Hale) appears in Flatland.
Ruler of the one-dimensional Pointland, initially skeptical of higher dimensions. Spherius (voice) (played by Michael York) appears in Flatland.
A sphere from Spaceland, reveals the truth of the third dimension to Flatlanders. Abbott Square (voice) (played by Joe Estevez) appears in Flatland.
Arthur Square's son, struggles with accepting dimensional revelations.