Alan Ritchson is 6 ft 3 in (190.5 cm). That is not just a recycled celebrity-height estimate: Ritchson has stated that height himself in a WIRED interview, and Amazon's own Reacher cast guide also describes him as 6 ft 3 in. In the current Stand Next To comparison, 190.5 cm is the effective height used for Ritchson and his published full-body figure.
Reacher Season 4 began streaming on Prime Video on August 12, 2026, with the first three episodes arriving together and new episodes releasing weekly through September 16. Amazon's current cast guide names eight Season 4 additions alongside Ritchson: Sydelle Noel, Chris Marquette, AGNEZ MO, Anggun, Kevin Weisman, Marc Blucas, Kevin Corrigan and Kathleen Robertson. Those nine actors make up this comparison.
Ritchson is the tallest person in the group at 190.5 cm. Marc Blucas, who plays John Sampson, is close behind at 188 cm. Kevin Corrigan is 178 cm, Sydelle Noel 174 cm, Kevin Weisman 173 cm and Chris Marquette 170 cm. AGNEZ MO is 165 cm, while Anggun and Kathleen Robertson are both 163 cm on the values used here. The full spread from Ritchson to the shortest listed height is 27.5 cm, or about 10.8 inches.
The closest comparison is Ritchson and Blucas: only 2.5 cm separates their listed heights. The gap becomes much more obvious by Kevin Corrigan, who is 12.5 cm shorter than Ritchson. A true-scale lineup makes that transition easier to read than separate publicity photos, where camera angle, shoes, posture and framing can make small differences look much larger or smaller.
The middle of the Season 4 group is compact. Sydelle Noel at 174 cm, Kevin Weisman at 173 cm and Chris Marquette at 170 cm sit within a 4 cm band. Compared directly with Ritchson, their listed gaps are 16.5 cm, 17.5 cm and 20.5 cm respectively. The shared floor line is especially useful here because it keeps those differences literal instead of impressionistic.
At the shorter end of the lineup, AGNEZ MO's 165 cm working value places her 25.5 cm below Ritchson. Anggun and Kathleen Robertson are each 163 cm, a 27.5 cm difference from Ritchson. Their identical listed heights also provide a useful check on the scale: two people with the same height value should occupy the same vertical height range even when their body proportions and figure widths differ.
The source quality is not identical for every actor. Ritchson has direct first-person evidence plus official Amazon corroboration. AGNEZ MO's 165 cm value is supported by a preserved direct statement, and Marc Blucas has a preserved first-person 6 ft 2 in statement. Several other co-star values are based mainly on IMDb height listings, so they are shown with medium confidence rather than being treated as measurements beyond dispute.
The visual uses the same current Stand Next To height and figure system as the individual person pages. Every figure is anchored to the same calibrated floor and scaled from its current effective height. On a smaller screen the lineup scrolls horizontally instead of shrinking everyone until the differences become meaningless. If a person's effective height or current figure later changes enough to invalidate this package, the story automatically drops out of normal search indexing until the underlying data is reviewed.
This makes the page a current Season 4 snapshot: Ritchson's well-supported 190.5 cm answer first, followed by a sourced nine-person comparison that shows what those numbers actually look like side by side.